06 Commercial Trucks
Box Trucks Repair For Lake Forest Owners
Box trucks are the most common commercial vehicle we repair and the one where the divided manufacture is most obvious. The cab follows chassis maker procedures with published parts and refinish specifications. The body follows nothing published at all, because it was built by a body company to an order and there is no repair manual for it. Working on both means keeping a stock of extrusion sections, FRP panel, rivets and fasteners rather than ordering a part number, and being able to fabricate what the original builder would have.
The most useful assessment we perform on a damaged box truck is checking whether the body is still square on the subframe. Bodies are mounted to the chassis with U bolts or brackets that can shift under impact, and a body that has moved a half inch on its mounts will produce door problems, seam leaks and panel cracking that look like separate issues. Measuring the body diagonals and checking the mounting hardware takes a technician thirty minutes and reframes the entire repair when it turns up something.
Paint on a box truck is really two jobs. The cab is refinished to automotive standards with a color that has a factory code and a known formula. The body is a large flat FRP or aluminum surface, usually white, usually carrying company graphics, and it refinishes closer to a trailer. When a repair crosses from one to the other we plan the transition at the natural break behind the cab rather than trying to carry a blend across two different substrates.
For Lake Forest operators running box trucks for moving, distribution, catering or trade supply, the recurring costs are clearance strikes and dock damage. Both are preventable and neither is entirely avoidable in real operations. Where an operator sees the same damage repeatedly across a fleet, we suggest practical measures such as corner protection, verified height marking in the cab and dock bumper checks. It is not a repair we get paid for, and it saves them a great deal.
What goes wrong on these
Rear corner posts that carry the whole rear of the body
The rear corner posts on a box body are aluminum extrusions that hold the door frame, tie the side wall to the roof and support the rear header. They are also the exact part that contacts a loading dock bumper, a gate post or another vehicle during backing. When a post is crushed, the door frame goes out of square immediately and the roll up door stops tracking. Straightening a crushed extrusion rarely restores it. Sectioning in a new post, splicing it to the existing rail with the correct fastening pattern, and resquaring the door frame is the durable repair.
Lift gate mounting that fatigues the chassis frame rather than the gate
A lift gate hangs off the rear of the frame rails and applies a large bending moment every time it lifts a load. The gate manufacturer specifies a mounting plate and a fastening pattern, and installers do not always follow it. What we find on a truck with several years of hard gate use is elongated bolt holes, cracked mounting plates and, on the worst installations, cracks in the frame rail web itself. Repairing the frame and remounting to the specified pattern with proper fish plates is the correct response, and it is not a job to improvise.
Roll up doors that fail because the body has racked, not because the door is worn
A roll up door on a box truck is a set of hinged slats guided by two tracks that curve into the ceiling. It requires the opening to be square within a fairly tight tolerance. When the body racks, whether from a corner impact, a frame issue or a subframe that has worked loose, the tracks are no longer parallel and the door binds. Operators respond by forcing it, which bends slats and pulls the door out of the track. Squaring the opening comes first. A door installed into a racked opening will fail again in weeks.
Body floors that rot from the underside where nobody inspects
The hardwood floor in a dry freight body sits directly on steel crossmembers, and water that enters at the rear threshold or through a side panel seam sits at that interface. The top face looks fine because it is swept daily. The underside rots, the fasteners lose their bite, and eventually a pallet jack wheel goes through. Checking a box floor from below during any service visit takes minutes and identifies the problem while it is still a section replacement rather than a full floor.
Damage we see most
- Rear corner post crushing from dock and gate contact
- Roll up door panel and track damage from forklift and load contact
- Roof bow and front header damage from overhead clearance strikes
- Side panel puncture and rivet line failure from post contact
- Lift gate mounting structure cracking at the frame attachment
- Cab corner and door damage from tight urban maneuvering
- Body floor rot at the rear threshold and around the wheel wells
- Rear bumper and ICC bar deformation from backing impacts
Typical ranges on this vehicle
| Work | Range | Labor |
|---|---|---|
| Commercial collision repair and paint refinish | $1,500 to $50,000 and up | 10 to 250 hours |
| Box and cargo body repair | $750 to $15,000 | 5 to 80 hours |
| Roll up and swing door service | $400 to $4,500 | 2 to 18 hours |
| Lift gate install and repair | $1,500 to $8,500 | 8 to 35 hours |
Planning ranges only. The written figure comes from inspecting the vehicle. See all posted rates.
What we do on a box trucks
Service
RV Collision Repair
Impact damage repair on motorhomes, trailers and vans, from documented teardown through structural rebuild, panel replacement and refinish.
Service
Major Collision Restoration
Full reconstruction after rollover, severe impact or cage damage, from strip down to sound structure through rebuilt house and systems.
Service
Structural Damage Assessment
Measured survey and written report on body structure, laminate bond, moisture and chassis dimension, with a prioritized repair scope.
Service
Frame and Chassis Straightening
Measured correction of bent or twisted chassis rails, crossmembers, A-frames and pin boxes using anchored pulls against factory datum.
Service
Custom Fabrication and Welding
One-off brackets, mounts, racks, reinforcements and replacements for discontinued parts, fabricated to measured dimensions in steel or aluminum.
Service
RV Body Panel Repair
Repair and replacement of exterior panels, compartment doors, skirts, moldings and trim on RVs, trailers and commercial bodies.
Service
RV Fiberglass Repair
Laminate rebuild for cracked, punctured or spidered fiberglass on caps, sidewalls and compartment doors, followed by fairing and refinish.
Service
Doors, Steps and Hardware
Entry, screen and compartment door alignment and repair, electric step service, latch, hinge, lock and keyless entry work.
Service
Flooring and Subfloor Replacement
New floor coverings plus structural deck repair, including soft spot mapping, rot removal and slide room clearance work.
Service
Roof Repair and Replacement
Membrane, fiberglass and aluminum roof repair, resealing, recoating and full replacement, including decking repair and every rooftop penetration.
Service
Water Intrusion and Leak Repair
Leak source tracing, moisture mapping, controlled water testing, and structural rebuild of framing, decking and panels that water has reached.
Service
Full RV Paint and Refinish
Complete exterior refinish of a coach or commercial body, from substrate preparation through primer, color and clear in a single continuous pass.
Bring it to the shop from Lake Forest
Collision, paint, fiberglass, roof, slide and systems work, all performed at the Yorba Linda facility. Tell us the vehicle and what happened and we will schedule intake.