Reference

The Words On Your Estimate

A collision estimate is written in trade shorthand. This glossary defines 147 of the terms that show up most often on an RV, trailer or commercial vehicle repair order, in the sense the shop and the carrier actually use them rather than the dictionary sense.

3

30-Amp ServiceElectrical and Power: A single 120 volt supply leg feeding the coach through a three prong TT-30 plug. It carries roughly thirty-six hundred watts total, which is why one roof air unit plus a water heater element will trip the park breaker on a hot afternoon.; See also: 50-Amp Service, Power Pedestal, Converter, Surge Protector

5

50-Amp ServiceElectrical and Power: A split phase supply delivering two independent 120 volt legs through a four prong plug. Roughly triple the capacity of the smaller service, which is what lets a large coach run two air conditioners, a residential fridge and an induction cooktop at once.; See also: 30-Amp Service, Power Pedestal, Transfer Switch, Roof Air

7

7-Way ConnectorChassis and Towing: The round blade plug between tow vehicle and trailer. Seven circuits ride through it: ground, running lights, left turn, right turn, electric brake output, a 12 volt charge line and a reverse or auxiliary pin. Corroded pins cause most phantom light faults.; See also: Electric Brake Controller, Breakaway Switch, Chassis Battery

A

Absorption RefrigeratorClimate and Appliances: A cooling unit with no compressor. Heat from an LP burner or an electric element drives an ammonia and hydrogen cycle through sealed tubing. It runs silently, tolerates being off grid, and needs the coach reasonably level to keep the solution circulating.; See also: LP Regulator, Leveling System, Roof Air
Actual Cash ValueInsurance and Claims: What the unit was worth the moment before the loss: replacement cost minus depreciation for age, mileage and condition. Most standard RV policies settle on this basis, and the figure often surprises owners who have been paying on a much larger loan balance.; See also: Agreed Value, Total Loss Threshold, Diminished Value, Adjuster
ADAS RecalibrationShop Process: Resetting the aim of forward cameras, radar modules and lane sensors after any repair that moved their mounting point. A windshield swap, a bumper cover, a ride height change or a chassis pull all put the sensor's idea of straight ahead out of true.; See also: Static Calibration, Dynamic Calibration, Post-Scan, Frame Rack
Adhesion PromoterPaint and Refinish: A thin chemical wipe or spray applied to raw plastic and flexible substrates so primer has something to bite into. Skipping it on a polypropylene bumper cover or an ABS trim piece is the usual reason a repair peels in a sheet a year later.; See also: Primer Surfacer, Basecoat, SMC, Panel Bond Adhesive
AdjusterInsurance and Claims: The carrier representative who inspects damage, writes the initial estimate and holds authority to approve added lines. Some are staff employees, some are contracted field reps, and RV claims are often handed to one who mostly writes automobile losses.; See also: Supplement, Independent Appraiser, First Notice of Loss, Deductible
Aftermarket PartInsurance and Claims: A component built by a company other than the one that supplied the original. Quality runs from excellent to unusable. On RV bodies the concern is usually fit at the seam and whether the surface will hold color the same way the neighboring panel does.; See also: OEM Part, Recycled Part, Remanufactured Part, LKQ
Agreed ValueInsurance and Claims: A policy form where owner and carrier settle on a stated figure at binding, and that figure is what pays out on a covered total loss. It costs more in premium and it removes the depreciation argument that dominates most settlement conversations.; See also: Actual Cash Value, Total Loss Threshold, Appraisal Clause
Anode RodPlumbing and Tanks: A sacrificial magnesium or aluminum rod threaded into a steel lined water heater tank. It corrodes on purpose so the tank does not. Once it is chewed down to the wire core it stops protecting anything and belongs in the trash.; See also: Water Heater Bypass, Low Point Drain, Water Pump
Appraisal ClauseInsurance and Claims: A dispute provision buried in most policies. When the owner and the carrier cannot agree on the amount of loss, each side names an appraiser, the two appraisers pick an umpire, and any two of the three set a binding number.; See also: Independent Appraiser, Actual Cash Value, Diminished Value
AquaHotClimate and Appliances: A trade name for a diesel fired hydronic system that heats a glycol loop and uses it for both cabin heat exchangers and domestic hot water. Common in high line diesel coaches. Service centers on the burner, the nozzle and the glycol itself.; See also: Hydronic Heating, Furnace Ducting, Water Heater Bypass
Awning ArmSlides and Awnings: The hinged lateral or scissor assembly that carries the roller tube away from the sidewall. Wind damage almost always bends the arm before it tears the cloth, and a bent arm transmits load straight into the wall anchor and its backing plate.; See also: Awning Fabric, Rub Rail, Slide Topper
Awning FabricSlides and Awnings: Vinyl or woven acrylic stretched between a roller tube and a wall channel. Vinyl resists rain and eventually delaminates into a sticky mess. Acrylic breathes and fades gracefully. Both fail first at the poly cord welt where the sun sits on the seam.; See also: Awning Arm, Slide Topper, Oxidation
AzdelStructure and Body: A composite substrate of polypropylene and fiberglass used in place of thin wood panel inside laminated walls. It does not absorb water, does not host mold and does not lose strength when wet, which changes how a soaked wall gets diagnosed.; See also: Lauan, Laminated Sidewall, Sandwich Panel, Delamination

B

BasecoatPaint and Refinish: The pigmented layer that carries color and any metallic or pearl flake. It has almost no gloss or durability by itself and exists only to be locked under clear. Application technique controls flake orientation, which is why two sprayers get two different looks.; See also: Clearcoat, Blend Panel, Tri-Coat, Flash Time
Battery IsolatorElectrical and Power: A relay or diode block that lets the alternator charge both battery banks while keeping them electrically separate. It is the reason running the furnace all night does not leave the starting bank too flat to crank in the morning.; See also: Chassis Battery, House Battery, Converter, Solar Charge Controller
Bearing RepackChassis and Towing: Pulling the hub, cleaning the old grease out of the tapered roller bearings, inspecting races for pitting, packing fresh grease and setting preload. Trailer axles want this on a schedule because a dry bearing seizes and takes the spindle with it.; See also: Torsion Axle, Leaf Spring, Wet Bolt, GAWR
BettermentInsurance and Claims: A deduction a carrier applies when the repair leaves the owner with something newer than what was damaged. Tires, batteries and roof membranes draw it most often. The owner is asked to pay the share of the part attributable to added remaining life.; See also: Deductible, Adjuster, Supplement, Actual Cash Value
Black TankPlumbing and Tanks: The sealed holding tank under the toilet. It takes solids and flush water and nothing else. Chronic odor and false level readings usually trace to a tank that gets dumped before it is full enough to move its contents rather than to the tank itself.; See also: Gray Tank, Macerator, Holding Tank Sensor, Low Point Drain
Blend PanelPaint and Refinish: An undamaged panel next to the repair that gets partial color so the eye never finds a hard edge. On a coach with long unbroken sidewalls there is often nowhere natural to stop, so the blend runs into a body break, a seam or a graphic line.; See also: Basecoat, Clearcoat, Spectrophotometer, Tri-Coat
BlueprintingShop Process: Writing the complete repair plan after teardown and before any parts are ordered. Every operation, every fastener, every sublet and every hour is captured in one document so the job does not stall three weeks in waiting on an approval nobody asked for.; See also: Teardown, Supplement, Pre-Scan, Moisture Meter Reading
Breakaway SwitchChassis and Towing: A pin switch on the trailer tongue tied to a cable on the tow vehicle. If the trailer separates, the pin pulls and the trailer battery slams the electric brakes on. A dead trailer battery makes the whole arrangement decorative.; See also: Electric Brake Controller, 7-Way Connector, Surge Brake
Bulb SealSlides and Awnings: A hollow round profile seal that squashes closed when a slide room or compartment door lands against it. The hollow section is what gives it travel. Once it takes a permanent set and stops rebounding, it stops sealing regardless of how it looks.; See also: D Seal, Wiper Seal, Slide Seal
Butyl TapeRoof and Sealing: A gray non-curing sealing tape laid under every roof penetration flange, window frame and trim strip before the fastener goes in. It never fully hardens, so it keeps sealing as the joint works. It is the bedding layer, not the topside sealant.; See also: Self-Leveling Lap Sealant, Non-Sag Sealant, Termination Bar, Seam Sealer

C

Cable SlideSlides and Awnings: A slide mechanism driven by steel cables running over pulleys at each corner of the room. It handles wide, heavy rooms well and keeps the floor clear of rails. When it goes out of square the fix is cable tension, not more motor.; See also: Schwintek, Hydraulic Slide, Rack and Pinion Slide, Slide Seal
Cargo Carrying CapacityChassis and Towing: What is left for people, gear, water and propane after the as-built weight is subtracted from the rating. It is printed on a yellow sticker inside a cabinet door. Full fresh water alone eats a large share of it on most travel trailers.; See also: GVWR, Dry Weight, Unloaded Vehicle Weight, GAWR
Chassis BatteryElectrical and Power: The starting bank that serves the engine, the dash and the chassis systems. It is a thin plate battery built for a short heavy burst, not for deep cycling, and it is kept apart from the living quarters bank on purpose.; See also: House Battery, Battery Isolator, Converter
Chopped Strand MatStructure and Body: Random short glass fibers held in a loose mat. Laid into resin it builds thickness quickly and conforms to curves, which makes it the workhorse layer behind a repaired cap. It contributes bulk and impact resistance more than directional strength.; See also: SMC, Gelcoat, Front Cap, Filon
City Water InletPlumbing and Tanks: The threaded fitting that accepts park pressure directly into the plumbing, bypassing the onboard pump. It contains a check valve that fails quietly. When it does, the pump starts pushing water back out the inlet instead of to the fixtures.; See also: Water Pump, Low Point Drain, Water Heater Bypass
ClearcoatPaint and Refinish: The unpigmented film sprayed over color. It supplies gloss, chemical resistance and the ultraviolet blocking that keeps the pigment underneath from breaking down. Almost every failure an owner calls a paint problem is really a clear failure.; See also: Basecoat, Film Build, Solvent Pop, Oxidation
ConverterElectrical and Power: The box that turns incoming 120 volt shore power into regulated 12 volt output for the lights, pumps and fans, and charges the living quarters bank while it does. A single stage unit that never drops out of bulk mode will cook a battery bank.; See also: Inverter, Shore Power, House Battery, Transfer Switch
Corner JackChassis and Towing: A stabilizing leg at each corner that takes flex out of the floor once the unit is parked. It is a stabilizer, not a lift. Using one to raise a wheel off the ground bends the mount and puts a crease in the frame rail above it.; See also: Leveling System, Subframe, King Pin

D

D SealSlides and Awnings: A seal whose cross section looks like the letter D, with a flat mounting face and a rounded compression side. It seals against a flat surface with a wiping action and is common along the vertical edges of slide rooms and compartment openings.; See also: Bulb Seal, Wiper Seal, Slide Seal
DeductibleInsurance and Claims: The portion of a covered loss the owner pays before the carrier pays anything. It is collected at delivery, not at drop off. On multi-vehicle collisions where another driver is clearly at fault, it is often recovered later through the carrier.; See also: Subrogation, First Party Claim, Adjuster, Betterment
DelaminationStructure and Body: The adhesive bond between the outer skin and the core of a laminated wall letting go. It shows up as a bubble, a wave or a soft area that reads hollow under a knuckle. Water, heat and time do it, and it spreads outward from wherever it started.; See also: Laminated Sidewall, Sandwich Panel, Filon, Moisture Meter Reading
DicorRoof and Sealing: A widely used trade name in RV roofing, most often heard for its self-leveling sealant and its membrane systems. Owners use the brand as a generic term. The important detail is chemistry compatibility with the membrane already on the roof.; See also: Self-Leveling Lap Sealant, EPDM, TPO, EternaBond
Diminished ValueInsurance and Claims: The market value a repaired unit loses purely because it now carries an accident history, even when the workmanship is perfect. Recovery depends on the state, the policy and whose carrier is paying. It is a separate claim from the cost of repair.; See also: Actual Cash Value, Third Party Claim, Salvage Title, Appraisal Clause
Dry RotStructure and Body: Fungal decay in structural wood that leaves it crumbly and light. The name misleads: it needs moisture to start. In sidewalls it follows a leak path downward and hollows out framing while the exterior skin still looks perfectly sound.; See also: Soft Spot, Lauan, Stringer, Moisture Meter Reading
Dry WeightChassis and Towing: The manufacturer's figure for the unit as it left the line with empty tanks and no options. It is a marketing number more than an operating one, since factory installed extras, batteries and propane are often outside what it counts.; See also: Unloaded Vehicle Weight, Cargo Carrying Capacity, GVWR, Tongue Weight
Dynamic CalibrationShop Process: Teaching a driver assistance sensor its aim by driving a prescribed route at a set speed range while the module learns from lane markings and traffic. It needs clear weather, legible striping and a road that cooperates, so it can take several attempts.; See also: Static Calibration, ADAS Recalibration, Post-Scan

E

Electric Brake ControllerChassis and Towing: The tow vehicle module that meters current to the trailer's electromagnets. Proportional units read deceleration and modulate with the tow vehicle. Time delay units ramp on a fixed curve and feel abrupt. Gain setting is what owners get wrong most.; See also: 7-Way Connector, Breakaway Switch, Surge Brake, Sway Control
EPDMRoof and Sealing: Ethylene propylene diene monomer, the black rubber membrane with a white weathering layer found on a great many RV roofs. It chalks off a fine white residue by design, which is normal until the sheet has given up enough thickness to matter.; See also: TPO, Self-Leveling Lap Sealant, Dicor, Termination Bar
EternaBondRoof and Sealing: A trade name for a butyl based seam tape with an aggressive backing that is meant to stay put once rolled down. It is a legitimate long term repair over a clean seam and a poor substitute for a roof that has already lost its membrane.; See also: Butyl Tape, EPDM, Termination Bar, Dicor

F

Fifth Wheel HitchChassis and Towing: A jaw and plate assembly mounted over the rear axle of a pickup that captures the trailer's pin. Placing the load ahead of the axle centerline rather than behind the bumper is what makes a heavy trailer track straight instead of steering the truck.; See also: King Pin, Pin Box, Gooseneck, Weight Distribution Hitch
Film BuildPaint and Refinish: Total dry thickness of the coating stack on a panel. Too little and the color goes transparent and the clear cannot be polished. Too much and it traps solvent, sags, and cracks the first time the panel takes a real thermal cycle.; See also: Mil Thickness, Clearcoat, Solvent Pop, Primer Surfacer
FilonStructure and Body: Fiberglass reinforced sheet bonded to the outside of a laminated wall, sold in rolls and named for one of the original suppliers. It is what gives a smooth sided coach its shell. Repairing it means matching gloss and texture across an enormous flat area.; See also: Gelcoat, Laminated Sidewall, Delamination, Azdel
First Notice of LossInsurance and Claims: The initial report that opens a claim file and produces a claim number. Everything downstream hangs off it, so getting the date, the location, the other party and an honest description right at this step saves weeks of correction later.; See also: Adjuster, Proof of Loss, First Party Claim, Deductible
First Party ClaimInsurance and Claims: A claim filed against the owner's own policy. The deductible applies, the owner's coverage terms govern, and the relationship is contractual, which generally moves faster than negotiating with a stranger's carrier over who did what.; See also: Third Party Claim, Deductible, Subrogation, Adjuster
FisheyePaint and Refinish: A small round crater in wet paint where the film pulled away from a spot of contamination. Silicone, wax and compressor oil are the usual culprits. It is a surface preparation and air supply problem, never something the paint itself caused.; See also: Solvent Pop, Orange Peel, Adhesion Promoter, Clearcoat
Flash TimePaint and Refinish: The wait between coats that lets solvent leave the film before the next pass traps it. Booth temperature, airflow and reducer speed all move the number. Rushing it is how a job that looked perfect at the gun blisters two days later.; See also: Solvent Pop, Basecoat, Clearcoat, Film Build
Frame RackShop Process: A fixed bench or floor anchor system that clamps a vehicle down so hydraulic force can be applied against a known reference. Without a rack, pulling a bent rail just drags the whole unit across the floor and moves nothing back to spec.; See also: Pull Tower, Structural Datum, Subframe, Unibody
Front CapStructure and Body: The molded one piece nose of a coach or trailer. Usually fiberglass, sometimes with an inner reinforcement, and often carrying the windshield opening, running lights and graphics. Replacing one is a body seam, a sealing and a paint job all at once.; See also: Rear Cap, Gelcoat, Chopped Strand Mat, Seam Sealer
Furnace DuctingClimate and Appliances: The flexible runs that carry heated air from the furnace plenum to floor registers. Crushed, disconnected or routed through an unheated bay, they are the reason one end of a coach never warms up while the burner runs constantly.; See also: Hydronic Heating, AquaHot, LP Regulator, Roof Air

G

GAWRChassis and Towing: Gross axle weight rating, the most any single axle is allowed to carry including tires, wheels, springs and brakes. A unit can sit under its total rating and still be well over on one axle, which is why corner weights beat a single scale pass.; See also: GVWR, GCWR, Cargo Carrying Capacity, Torsion Axle
GCWRChassis and Towing: Gross combination weight rating, the ceiling for tow vehicle and trailer loaded together. It accounts for what the engine, cooling system, brakes and driveline can handle as a pair, and it is the number most first time buyers never look up.; See also: GVWR, GAWR, Fifth Wheel Hitch, Tongue Weight
GelcoatStructure and Body: A pigmented resin surface layer sprayed into the mold first, so it ends up as the outermost skin of a fiberglass part. It is color and protection in one, it is thicker than paint, and it can be sanded and buffed back from moderate chalking.; See also: Oxidation, Spider Cracking, Filon, Front Cap
GeneratorElectrical and Power: An onboard engine driven alternator that makes 120 volt power away from a pedestal. Gasoline, diesel and LP versions all exist. Most no-start complaints come down to stale fuel, a dirty pickup screen or a start battery nobody has load tested.; See also: Transfer Switch, Shore Power, Inverter, Chassis Battery
GooseneckChassis and Towing: A towing arrangement using a ball mounted in the truck bed and a downward tube on the trailer. It puts load over the rear axle like a fifth wheel but with a smaller, lighter connection. Adapters between the two styles change how load reaches the frame.; See also: Fifth Wheel Hitch, Pin Box, King Pin
Gray TankPlumbing and Tanks: The holding tank for sink and shower drainage. It fills faster than owners expect because showers are the largest single water use in a coach. Soap scum and hair build a film on the sensor probes long before the tank itself needs attention.; See also: Black Tank, Holding Tank Sensor, Macerator, Low Point Drain
GVWRChassis and Towing: Gross vehicle weight rating, the maximum the unit is designed to weigh fully loaded. It is set by the manufacturer against the weakest link in frame, suspension, brakes and tires. Nothing an owner adds later raises it, whatever the parts catalog claims.; See also: GAWR, GCWR, Cargo Carrying Capacity, Dry Weight

H

Holding Tank SensorPlumbing and Tanks: Probes bonded through the tank wall that complete a circuit when waste bridges them. Residue clinging to a probe holds that circuit closed, so the panel reports a level that no longer exists. Cleaning the probes fixes more of these than new hardware does.; See also: Black Tank, Gray Tank, Macerator
House BatteryElectrical and Power: The deep cycle bank that runs the living quarters: lights, pumps, fans, the control boards and anything the inverter feeds. Built with thick plates to be drawn down and brought back repeatedly, unlike the bank that turns the engine over.; See also: Chassis Battery, LiFePO4, Converter, Inverter
Hydraulic SlideSlides and Awnings: A slide room pushed and pulled by hydraulic cylinders fed from a central pump. It moves the heaviest rooms without complaint. Diagnosis usually starts at fluid level and cylinder seals rather than at the room itself.; See also: Schwintek, Cable Slide, Rack and Pinion Slide, Leveling System
Hydronic HeatingClimate and Appliances: Cabin heat delivered by circulating hot glycol through exchangers with small fans instead of blowing furnace air through ducts. It heats evenly, runs quietly and usually shares its boiler loop with domestic hot water and an engine preheat circuit.; See also: AquaHot, Furnace Ducting, Water Heater Bypass

I

Independent AppraiserInsurance and Claims: A third party hired to inspect and value a loss without working for either side's payroll. Carriers use them in regions where they have no staff, and owners retain them when a settlement figure needs an outside opinion behind it.; See also: Appraisal Clause, Adjuster, Actual Cash Value, Diminished Value
InverterElectrical and Power: The unit that turns stored 12 volt energy into 120 volt output for outlets and appliances when no shore cord is plugged in. Pure sine output matters for electronics and induction cooktops. Modified sine costs less and irritates sensitive loads.; See also: Converter, Transfer Switch, House Battery, LiFePO4

K

King PinChassis and Towing: The steel pin projecting down from the front of a fifth wheel trailer that locks into the hitch jaws. Its height, its wear and the squareness of the plate around it determine whether the trailer rides level and whether the jaws close fully.; See also: Pin Box, Fifth Wheel Hitch, Gooseneck, Subframe

L

Laminated SidewallStructure and Body: A wall built as a bonded stack rather than a framed cavity: outer skin, adhesive, insulation and framing at the same depth, then an interior panel, pressed flat as one piece. Stiff, light and unforgiving once water gets between the layers.; See also: Sandwich Panel, Delamination, Azdel, Filon
LauanStructure and Body: A thin tropical hardwood plywood long used as the inner face of laminated walls and as ceiling panel. It is light and cheap and it wicks water along the grain, which is exactly why a small roof leak turns into a wall sized repair.; See also: Azdel, Dry Rot, Laminated Sidewall, Soft Spot
Leaf SpringChassis and Towing: Stacked steel strips arched between hangers to carry axle load. Simple, repairable and easy to overload. A flattened or reverse arched pack is a sign the trailer has been running heavy, and it changes ride height enough to matter at the hitch.; See also: Shackle, Wet Bolt, Torsion Axle, GAWR
Leveling SystemChassis and Towing: Powered jacks with a controller that reads a sensor and brings the coach level. Automatic systems will happily lift a unit off its tires, which unloads the suspension and puts the whole structure on four points. Slide rooms should move only after it settles.; See also: Corner Jack, Hydraulic Slide, Absorption Refrigerator, Subframe
LiFePO4Electrical and Power: Lithium iron phosphate chemistry for the living quarters bank. It gives most of its rated capacity instead of half, holds voltage flat under load and weighs far less than lead. It needs a charge profile built for it and dislikes charging below freezing.; See also: House Battery, Converter, MPPT, Solar Charge Controller
LippertChassis and Towing: A large supplier of RV chassis, frames, axles, slide mechanisms, leveling systems and entry components. Because so many brands buy from the same source, the part on two very different coaches is often identical underneath the badge.; See also: Schwintek, Subframe, Leveling System, Torsion Axle
LKQInsurance and Claims: Like kind and quality. Estimate shorthand for a used assembly pulled from a comparable unit, matched on age, condition and equipment level. Carriers favor it on older coaches where a new molded cap costs more than the coach is worth.; See also: Recycled Part, OEM Part, Aftermarket Part, Actual Cash Value
Loss of UseInsurance and Claims: Coverage for what it costs the owner to be without the unit while it is being repaired. On RVs it may pay lodging or a rental rather than a loaner, and the daily limit and total cap are set in the policy long before the collision.; See also: Storage Fee, Deductible, Adjuster, First Party Claim
Low Point DrainPlumbing and Tanks: Valves at the bottom of the hot and cold lines that let the system gravity drain. They are the first step in winterizing and the last thing anyone remembers to close in spring, which produces a very confusing loss of pressure.; See also: Water Pump, Water Heater Bypass, City Water Inlet, Anode Rod
LP RegulatorClimate and Appliances: The two stage device that drops tank pressure to the low, steady working pressure appliances expect. When it drifts, the furnace lights and the range burners go yellow, or the refrigerator loses its flame on the road and nobody notices for hours.; See also: Absorption Refrigerator, Furnace Ducting, Hydronic Heating

M

MaceratorPlumbing and Tanks: A grinder pump at the waste outlet that reduces solids and pushes them through a small hose instead of a three inch gravity line. It makes dumping possible uphill or at a distance, and it is intolerant of anything that should not have gone in the toilet.; See also: Black Tank, Gray Tank, Holding Tank Sensor
Mil ThicknessPaint and Refinish: Coating depth measured in thousandths of an inch with a gauge on the panel. It is how a shop proves the stack landed where the paint maker specified, and it is the fastest way to tell an original factory finish from an earlier repaint.; See also: Film Build, Clearcoat, Primer Surfacer, Print Through
Moisture Meter ReadingShop Process: A pin or pinless gauge reading taken through a wall, floor or roof to map where water sits. Readings are compared against a known dry area on the same unit, because the absolute number means little without that baseline to read it against.; See also: Delamination, Soft Spot, Dry Rot, Teardown
MPPTElectrical and Power: Maximum power point tracking. A solar controller that converts excess panel voltage into usable charging current instead of throwing it away. On cold bright days it returns meaningfully more energy than the simpler switching type of controller.; See also: Solar Charge Controller, LiFePO4, House Battery

N

Non-Sag SealantRoof and Sealing: A thicker sealant formulated to stay where it is tooled on a vertical or sloped surface. It belongs on sidewall penetrations and cap seams. Using the flowing roof grade in those places just puts a stripe down the paint.; See also: Self-Leveling Lap Sealant, Butyl Tape, Seam Sealer, Termination Bar

O

OEM PartInsurance and Claims: A component sourced from the original manufacturer or its supplier, in the original packaging. On RVs the supply chain is thin and lead times on molded caps and slide components can run months, which drives most of the schedule conversation.; See also: Aftermarket Part, Recycled Part, Remanufactured Part, LKQ
Orange PeelPaint and Refinish: A dimpled surface texture left when the paint did not flow out flat before it set. Gun setup, air pressure, reducer choice and booth temperature all feed it. Mild texture sands and polishes out. Severe texture means the panel gets sprayed again.; See also: Clearcoat, Film Build, Fisheye, Flash Time
OxidationPaint and Refinish: Ultraviolet breakdown of the outermost coating layer, leaving a chalky, dull surface that transfers to a rag. On gelcoat it is often recoverable with staged compounding. Once it has eaten through to the pigment layer, only refinishing brings the color back.; See also: Gelcoat, Clearcoat, Spider Cracking, Awning Fabric

P

Panel Bond AdhesiveStructure and Body: A two part structural epoxy or urethane used to join panels where the manufacturer bonded rather than welded. It carries real load, seals the joint against corrosion and needs specific flange preparation, clamp pressure and cure temperature to develop strength.; See also: Seam Sealer, Adhesion Promoter, Unibody, Sandwich Panel
Pin BoxChassis and Towing: The bolted or welded structure at the nose of a fifth wheel trailer that carries the king pin and transfers load into the frame. Air ride and articulating versions swap in here to take shock out of the connection on rough pavement.; See also: King Pin, Fifth Wheel Hitch, Subframe, Gooseneck
Post-ScanShop Process: A full module scan run after repairs are complete to confirm nothing is still reporting and that every code cleared for a reason. It is the paper trail proving the electronics left in the condition they arrived in, and it belongs in the file.; See also: Pre-Scan, ADAS Recalibration, Static Calibration, Dynamic Calibration
Power PedestalElectrical and Power: The park supplied post carrying the breakers and receptacles a coach plugs into. Voltage sags, open neutrals and miswired outlets all originate here, and the damage they do downstream is charged to whoever plugged in without checking it first.; See also: Shore Power, Surge Protector, 30-Amp Service, 50-Amp Service
Pre-ScanShop Process: A diagnostic sweep of every module before teardown starts, capturing stored and active codes as the unit arrived. It separates collision related faults from pre-existing ones and prevents a long argument later about what the impact actually caused.; See also: Post-Scan, Blueprinting, Teardown, ADAS Recalibration
Primer SurfacerPaint and Refinish: A high build undercoat sprayed over repair work and then blocked flat. Its job is filling sand scratch and minor contour error so the color layer lands on one uninterrupted plane. Sealing it before color keeps solvent from reaching what is underneath.; See also: Adhesion Promoter, Film Build, Print Through, Basecoat
Print ThroughPaint and Refinish: The outline of body filler, a repair edge or a fiberglass weave showing faintly through fresh paint weeks after delivery. It comes from shrinkage continuing under the film, usually because a coat went on heavy or did not cure long enough before sanding.; See also: Primer Surfacer, Mil Thickness, Chopped Strand Mat, Film Build
Proof of LossInsurance and Claims: A sworn statement of what was damaged and what it is worth, submitted on the carrier's form within a deadline the policy sets. Ignoring the deadline can close a file that was otherwise going fine, so it gets calendared the day it arrives.; See also: First Notice of Loss, Adjuster, Salvage Title, Total Loss Threshold
Pull TowerShop Process: The upright post on a frame rack that anchors a chain and applies directional force through a hydraulic ram. Correction is made in stages with measurements between pulls, because steel that is dragged too far in one attempt has to be brought back.; See also: Frame Rack, Structural Datum, Unibody, Subframe

R

Rack and Pinion SlideSlides and Awnings: A slide mechanism with toothed racks under each side of the room driven by a shared shaft, so both sides advance together and the room stays square. Timing between the two sides is the thing that needs setting when it starts to bind.; See also: Schwintek, Cable Slide, Hydraulic Slide, Slide Seal
Rear CapStructure and Body: The molded tail section of a coach or trailer, carrying tail lights, the ladder mount and often a spare tire or bike rack. It takes the most low speed impact damage of any panel because it is what backs into things.; See also: Front Cap, Gelcoat, Rub Rail, Chopped Strand Mat
Recycled PartInsurance and Claims: A component removed from a donor unit and resold as is. It saves both money and lead time, and it is often the only route to a discontinued molded panel. Condition grading and the color it already wears decide whether it is worth using.; See also: LKQ, OEM Part, Aftermarket Part, Salvage Title
Remanufactured PartInsurance and Claims: A used core disassembled, cleaned, measured, restored with new wear items and tested against a specification before resale. Different from a recycled assembly, which is sold in whatever state it came off the donor without that rebuild step.; See also: Recycled Part, OEM Part, Aftermarket Part
Roof AirClimate and Appliances: A rooftop air conditioner sitting in a fourteen inch square opening, sealed to the roof by a gasket that the mounting bolts compress. Overtightening crushes the gasket and starts a leak. Undertightening leaves the same leak from the other direction.; See also: Soft Start, 50-Amp Service, EPDM, Furnace Ducting
Roof TrussStructure and Body: The transverse member spanning sidewall to sidewall that sets the roof crown and carries anything mounted above it. Air conditioners, vents and racks all land on or between trusses, and a rotted one lets the roof sag until it ponds water.; See also: Stringer, Subframe, Dry Rot, Sandwich Panel
Rub RailStructure and Body: The horizontal extrusion running the length of the sidewall where the wall meets the floor line. It hides the joint, catches the first contact from posts and curbs, and channels water away. Behind it sits sealant that nobody inspects until it fails.; See also: Awning Arm, Rear Cap, Non-Sag Sealant, Laminated Sidewall

S

Salvage TitleInsurance and Claims: A branded title issued after a carrier declares a unit a total loss and takes ownership. It follows the vehicle permanently, changes what insurance and financing are available, and drops resale value well below an equivalent clean titled unit.; See also: Total Loss Threshold, Diminished Value, Actual Cash Value, Recycled Part
Sandwich PanelStructure and Body: Two stiff outer faces bonded to a light core, which gets high stiffness from very little weight. The whole idea depends on the bond holding, so once the faces and core separate the panel loses most of its strength while still looking intact.; See also: Laminated Sidewall, Delamination, Azdel, Roof Truss
SchwintekSlides and Awnings: An in-wall slide system using vertical toothed tracks on each side of the opening driven by two synchronized motors. It saves floor space in smaller rooms. Its weakness is that the two sides fall out of sync and the room jams at an angle.; See also: Lippert, Rack and Pinion Slide, Cable Slide, Slide Seal
Seam SealerStructure and Body: The bead applied along a panel joint after fitting and before paint. It keeps water out of the lap, blocks corrosion between mating metals and restores the factory appearance of the seam. Brushed, sprayed or tooled depending on where the original ran.; See also: Panel Bond Adhesive, Non-Sag Sealant, Butyl Tape, Front Cap
Self-Leveling Lap SealantRoof and Sealing: A flowing roof sealant that spreads out on its own to feather over a horizontal seam or flange. It is meant only for surfaces near flat. Applied to a wall it runs, and applied over an incompatible membrane it never bonds properly to begin with.; See also: Non-Sag Sealant, Dicor, EPDM, Termination Bar
ShackleChassis and Towing: The short swinging link that ties one end of a leaf spring to its hanger and lets the pack change length as it flexes. Worn shackles and elongated holes show up as clunking, uneven tire wear and an axle that no longer sits square to the frame.; See also: Leaf Spring, Wet Bolt, Torsion Axle
Shore PowerElectrical and Power: Utility supplied 120 volt power reaching the coach through its cord instead of coming from batteries or an onboard engine. The term carries over from boats. Everything about the coach's electrical behavior changes at the moment that cord is connected.; See also: Power Pedestal, Transfer Switch, Converter, Surge Protector
Slide SealSlides and Awnings: The complete perimeter sealing package around a slide opening, usually several profiles working together on the inner and outer faces. Because the room moves, these seals do their job in two different positions and wear at different rates in each.; See also: Bulb Seal, D Seal, Wiper Seal, Slide Topper
Slide TopperSlides and Awnings: A spring loaded fabric awning mounted above a slide room that unrolls as the room extends. It keeps leaves, needles and standing water off the slide roof. When its spring tension is lost the fabric sags and holds the very water it was meant to shed.; See also: Awning Fabric, Awning Arm, Slide Seal, Hydraulic Slide
SMCStructure and Body: Sheet molding compound, a pressed composite of chopped glass, resin and filler used for caps, doors and heavy exterior panels. It is rigid and dimensionally stable, it cracks rather than dents, and it demands its own adhesive and primer chemistry.; See also: Chopped Strand Mat, Panel Bond Adhesive, Adhesion Promoter, Gelcoat
Soft SpotStructure and Body: An area of floor, wall or roof that flexes underfoot or under thumb pressure because the structure beneath has lost integrity. It is a symptom, not a diagnosis. The leak that caused it is almost always upstream and higher than the spot itself.; See also: Dry Rot, Moisture Meter Reading, Delamination, Lauan
Soft StartClimate and Appliances: A capacitor module wired into an air conditioner that reduces the inrush surge at compressor startup. It lets a small generator or a limited pedestal carry a unit that would otherwise stall the supply the instant the compressor kicks in.; See also: Roof Air, Generator, 30-Amp Service, Inverter
Solar Charge ControllerElectrical and Power: The regulator between roof panels and the battery bank that decides how much current flows and when to taper. Without one, panels overcharge the bank on a bright day and deliver nothing useful once the voltage relationship falls apart.; See also: MPPT, LiFePO4, House Battery, Battery Isolator
Solvent PopPaint and Refinish: Pinholes opened in a cured film by solvent that was still trying to escape when the surface skinned over. Heavy coats, short flash intervals and forcing heat too early all produce it, and the only real correction is back to bare and start again.; See also: Flash Time, Film Build, Clearcoat, Fisheye
SpectrophotometerPaint and Refinish: A handheld instrument that reads a panel's color at several angles and returns candidate formulas from the paint maker's database. It narrows the search fast. A sprayed and dried let down panel still decides which candidate actually goes on the coach.; See also: Blend Panel, Tri-Coat, Basecoat
Spider CrackingPaint and Refinish: A web of fine cracks radiating from a stress point in gelcoat, usually where a fastener, an impact or a flexing panel concentrated load. The cracks are in the surface layer, but they mark where the laminate underneath has been working.; See also: Gelcoat, Oxidation, Front Cap, Chopped Strand Mat
Static CalibrationShop Process: Aiming a sensor with the vehicle stationary and a printed target set at a measured distance and height on a level floor. It demands space and a controlled surface, which is why a large coach can be harder to calibrate than the sensor itself suggests.; See also: Dynamic Calibration, ADAS Recalibration, Post-Scan, Structural Datum
Storage FeeInsurance and Claims: A daily charge for holding a unit that is not being actively repaired, typically after a settlement decision stalls or the owner stops responding. It accrues quietly and becomes a real number on a rig that occupies a large share of a lot.; See also: Loss of Use, Total Loss Threshold, Adjuster
StringerStructure and Body: A longitudinal framing member running fore and aft through a floor or wall assembly. It carries load between the crossmembers and gives fasteners something solid to land in. Water tracking along one is a common path for rot to travel a long way.; See also: Roof Truss, Subframe, Dry Rot, Laminated Sidewall
Structural DatumShop Process: The fixed reference planes a measuring system works from: a centerline, a datum height and a zero point along the length. Every dimension in a repair is stated against them, so establishing them correctly comes before any correction is attempted.; See also: Frame Rack, Pull Tower, Unibody, Blueprinting
SubframeStructure and Body: The welded or bolted steel structure the body sits on, tying axles, hitch and floor together. On trailers it is the whole load path. Straightening a tweaked subframe is measured work, not eyeballed work, and it precedes any body repair above it.; See also: Unibody, Frame Rack, Pin Box, Structural Datum
SubrogationInsurance and Claims: The process where an owner's carrier pays the claim first and then pursues the at fault party's carrier to get its money back. When it succeeds, the deductible usually comes back to the owner, though the timeline is measured in months.; See also: Deductible, First Party Claim, Third Party Claim, Adjuster
SupplementInsurance and Claims: An addition to an approved estimate covering damage that only became visible once panels came off. RV work generates them routinely, because water intrusion and hidden structural damage are almost never fully visible from the outside.; See also: Blueprinting, Teardown, Adjuster, Betterment
Surge BrakeChassis and Towing: A hydraulic trailer brake actuated by the trailer pushing against the coupler under deceleration, with no wiring to the tow vehicle. Common on boat trailers and smaller utility trailers. Backing uphill needs a lockout or the brakes fight the reverse.; See also: Electric Brake Controller, Breakaway Switch, 7-Way Connector
Surge ProtectorElectrical and Power: A device between the pedestal and the coach that watches for high or low voltage, open ground, reversed polarity and open neutral, and disconnects before the fault reaches the appliances. The models that only clamp spikes miss most of what damages RVs.; See also: Power Pedestal, Shore Power, Transfer Switch, Converter
Sway ControlChassis and Towing: Friction bars, cam arrangements or hitch head geometry that resist the trailer's tendency to oscillate behind the tow vehicle. Sway is usually a load distribution symptom, so control hardware manages what correcting the tongue load should have prevented.; See also: Weight Distribution Hitch, Tongue Weight, Electric Brake Controller

T

Tap TestShop Process: Working across a fiberglass or laminated surface with a knuckle or a light plastic hammer and listening. Bonded material rings tight. Separated material answers dull and hollow. It maps the edges of hidden damage in minutes and costs nothing to run.; See also: Delamination, Soft Spot, Moisture Meter Reading, Teardown
TeardownShop Process: Controlled disassembly of the damaged area so the true extent of the loss can be seen, photographed and measured. It happens before the repair plan is finalized, because on a coach the visible damage is regularly the smaller half of the job.; See also: Blueprinting, Supplement, Tap Test, Pre-Scan
Termination BarRoof and Sealing: A mechanical strip fastened along the edge of a roof membrane where it meets a wall or a raised feature, clamping the sheet down before sealant goes over it. Sealant alone at that edge peels. The bar carries the load and the sealant blocks water.; See also: EPDM, TPO, Self-Leveling Lap Sealant, EternaBond
Third Party ClaimInsurance and Claims: A claim filed directly against the at fault party's carrier. There is no deductible for the owner, but liability has to be accepted first, and the owner has no contract with that carrier to compel it to move quickly.; See also: First Party Claim, Subrogation, Diminished Value, Adjuster
Tire Date CodeChassis and Towing: The four digit stamp at the end of the sidewall serial, giving the week and the year the tire was built. RV tires age out long before they wear out, so the code matters more than tread depth on a unit that sits parked most of the year.; See also: GAWR, Bearing Repack, Torsion Axle
Tongue WeightChassis and Towing: The downward load a conventional trailer puts on the hitch ball, ideally somewhere between ten and fifteen percent of the loaded trailer weight. Too little starts sway. Too much lifts the front of the tow vehicle and takes steering authority with it.; See also: Weight Distribution Hitch, Sway Control, Cargo Carrying Capacity, GCWR
Torsion AxleChassis and Towing: An axle that springs on rubber cords twisted inside a square tube instead of on leaf packs. It rides quietly and mounts independently at each side, but the rubber takes a set with age and cannot be adjusted back, so the whole axle gets replaced.; See also: Leaf Spring, Shackle, GAWR, Bearing Repack
Total Loss ThresholdInsurance and Claims: The point at which repair cost plus salvage value crosses a carrier's or a state's limit and the unit is declared a total rather than repaired. On older coaches the low market value gets there quickly even when the structural damage is modest.; See also: Actual Cash Value, Salvage Title, Agreed Value, Storage Fee
TPORoof and Sealing: Thermoplastic polyolefin membrane, a lighter colored roofing sheet that does not chalk the way rubber does. It is heat weldable at the seams and it wants sealants matched to its own chemistry, which is where most repairs on it go wrong.; See also: EPDM, Termination Bar, Self-Leveling Lap Sealant, Dicor
Transfer SwitchElectrical and Power: The relay assembly that decides which source feeds the 120 volt panel and never lets two connect at once. Shore, generator and inverter each get priority in a set order. A chattering or welded switch is behind a surprising share of odd power complaints.; See also: Shore Power, Generator, Inverter, Converter
Tri-CoatPaint and Refinish: A finish built in three stages: a solid ground coat, a translucent mid coat carrying pearl or candy pigment, then clear. Color depends on how many mid coats went on, so matching one means spraying test cards before the panel ever sees a gun.; See also: Basecoat, Clearcoat, Blend Panel, Spectrophotometer

U

UnibodyStructure and Body: Construction where the body shell and the structure are one integrated assembly rather than a body bolted onto a separate frame. Common under camper vans built on commercial chassis. Damage travels further through the structure than it does on a ladder frame.; See also: Subframe, Structural Datum, Frame Rack, Panel Bond Adhesive
Unloaded Vehicle WeightChassis and Towing: What the unit weighs as built and as shipped, including factory installed options, full engine fluids and generator fuel, but without water, propane, cargo or people. It is the honest starting point that the marketing figure often is not.; See also: Dry Weight, Cargo Carrying Capacity, GVWR, GAWR

W

Water Heater BypassPlumbing and Tanks: A valve arrangement that routes plumbing around the water heater tank so antifreeze can fill the lines without filling six or ten gallons of tank first. Left in the bypass position in spring, it produces a coach with no hot water and no obvious fault.; See also: Anode Rod, Low Point Drain, Water Pump, City Water Inlet
Water PumpPlumbing and Tanks: The 12 volt diaphragm pump that pressurizes the plumbing from the onboard fresh tank. It cycles on demand from a pressure switch, so a pump that clicks on with every tap closed is reporting a leak or a failed check valve somewhere in the system.; See also: City Water Inlet, Low Point Drain, House Battery
Weight Distribution HitchChassis and Towing: Spring bars that lever some of the tongue load forward onto the tow vehicle's front axle and back onto the trailer axles instead of letting it all sit on the rear bumper. Correctly set, it restores front axle weight and with it steering and braking.; See also: Tongue Weight, Sway Control, GCWR, Fifth Wheel Hitch
Wet BoltChassis and Towing: A grease fitted suspension bolt with bronze bushings that can be lubricated in place. It replaces the plain bolt and nylon bushing many trailers ship with, which wear into an oval and let the spring hanger move where it should not.; See also: Shackle, Leaf Spring, Bearing Repack
Wiper SealSlides and Awnings: A thin flexible blade seal that drags across the slide room surface as it travels, sweeping grit and water off the panel before it reaches the compression seals behind it. It is the sacrificial one, and it is the one most often found torn.; See also: Bulb Seal, D Seal, Slide Seal, Slide Topper

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