Frame, floor, walls, doors
Damaged trailer rebuilt. Back to roadworthy.
Frame straightening, floor replacement, wall and door repair, rear-frame rebuilds. Welding, alignment, and refurbishment done in-house by techs who know structural work.
Structural damage to a trailer doesn't always mean the trailer is done. A bent frame can be straightened. A holed floor can be cut out and replaced. A damaged rear frame can be rebuilt. Knox Trailers does structural repair in-house — welding, cutting, fabrication, alignment, paint — without sending trailers out to specialty shops. Most structural work that other shops would total, we can put back on the road.
Structural work we run in-house
Frame straightening and repair
Bent main rails, twisted frames, broken crossmembers. Frame straightening with calibrated tools. Crossmember replacement. Welded repairs to manufacturer spec where applicable.
Floor replacement
Rotted or damaged floors cut out and replaced. Hardwood, composite, and steel floor options. Floor logistics rails and threshold replacement.
Wall and roof repair
Side wall panel replacement (plate, sheet, or post-and-panel construction). Roof bow replacement, roof panel repair, roof skin replacement.
Rear frame and door repair
Rear frame straightening or replacement. Roll-up door repair and replacement. Swing door alignment, hinge work, and full door replacement. Threshold rebuilds.
Welding and fabrication
MIG, TIG, and stick welding. Steel, aluminum, and stainless work. Custom fabrication for trailer-specific repairs. Certified welders on staff.
Refurbishment and paint
Trailer refurbishment for older units. Full repaint, lettering, and graphics. Yard-ready aesthetic refresh that extends usable life.
Schedule the work or get a quote.
Mon–Fri 7am–6pm. Same-day appointments most weeks.
What good looks like
When you bring a trailer to Knox Trailers, here's what you should expect.
- Damage assessment within 24 hours of trailer arrival
- Repair quote with photos before any work starts
- Realistic timeline given upfront — no surprise delays
- All structural work done in-house, not subbed out
- DOT-compliant repairs documented in writing
- Pre-delivery inspection before you pick it up
Why fleet managers bring damaged trailers here
Most fleet managers expect a totaled trailer when there's serious structural damage. We've seen too many trailers that other shops gave up on that were absolutely fixable. Bent frame? Straightenable. Rotted floor? Replaceable. Roll-up door destroyed? Replace it. The math usually works in your favor — repair beats replacement most of the time.
We do this work in-house because we've found subbed-out structural work creates more problems than it solves. Our welders are certified. Our frame straightening tools are calibrated. Our paint booth is on site. The trailer doesn't leave our yard until it's roadworthy.
Common questions
How do I know if a damaged trailer is worth repairing?
Send us photos or bring the trailer in. We'll assess it and give you a real number. We won't waste your money on a trailer that should be retired, but we won't write off a trailer that's economically repairable either.
How long does structural repair take?
Depends entirely on the damage. Simple repairs (rear frame, door work) — a few days. Major work (frame straightening, full floor replacement) — one to three weeks. We give a real timeline at the quote stage so you can plan.
Will the repair pass DOT inspection?
Yes. Every structural repair we do meets or exceeds DOT requirements. We document the work and provide paperwork that holds up at roadside inspection.
Related services
DOT Inspections
Annual inspections, follow-up corrections, fleet PM programs. We get your trailers compliant and back on the road without the runaround.
Learn more →Brake Repair
Slack adjusters, air lines, chambers, drums, shoes, and full brake system rebuilds for box vans and trailers. Parts in stock. Techs who know the work.
Learn more →Mobile Service
Mobile service trucks dispatched same-day for trailer repair at your yard, the highway, or wherever you broke down. We carry common parts. We bill less than your downtime costs.
Learn more →Ready to get it fixed?
Same-day appointments most weeks for fleet customers. Call or request a quote and we'll get you scheduled.