Collision and Structural
Frame Straightening and Structural Repair
In short: A bent frame is repairable far more often than owners are told, and a chassis measured back to factory specification is structurally sound, which is why frame straightening runs $3,000 to $18,000 rather than the total loss most people expect.
- Typical range
- $3,000 to $18,000+
- Labor hours
- 15 to 90 hours
- Updated
Frame damage is the point where most owners are told their vehicle is finished. In our experience that conclusion is wrong more often than it is right, and the reason is that the people delivering it are usually reading an estimate rather than a measurement.
A frame is a structure with a specification. It either matches that specification or it does not, and the amount by which it does not is a number you can put on paper. Everything downstream, whether the repair is economic, whether the vehicle will track straight, whether a slide-out will seat, follows from that number. A shop that has not measured is not in a position to tell you anything.
What frame damage actually does to a large vehicle
On a motorhome or a commercial truck, the chassis is the datum for everything bolted to it. Move it and the consequences show up in places that seem unrelated.
Slide-outs bind or will not seal. A slide room is engineered to a tolerance measured in fractions of an inch. Twist the frame under it and the opening is no longer square, so the room racks as it travels. Owners report this as a slide motor problem and replace the motor twice before anyone checks the chassis.
Doors and compartments stop latching. Same cause. The opening moved.
Tires wear on one edge and the vehicle pulls. This gets chased through alignment shops for years. Alignment adjusts suspension geometry within a range that assumes the frame underneath it is correct. If it is not, the alignment is being set to compensate for a bent structure, and the compensation runs out.
Roof and sidewall seams open. A twisted structure puts the shell into tension it was not designed for. The seam opens, water enters, and eighteen months later there is delamination and soft flooring that nobody connects back to the accident.
Mounting points crack. Suspension perches, engine mounts, hitch receivers. On a vehicle at 26,000 pounds these are not cosmetic failures.
How the work runs
Assessment and measurement first. The chassis goes on the rack. We take reference measurements in three planes against manufacturer specification and produce a printed comparison. This is the document that determines whether the job proceeds and what it costs.
Teardown for access. A frame cannot be pulled with the body sitting on it. Panels, interior, and anything in the pull path comes off. On a coach this is frequently a larger job than the straightening itself.
Straightening. The chassis is anchored and pulled with hydraulic rams against the measured deviation. This is slow work done in increments with re-measurement between pulls, because steel that is pulled too far too fast work-hardens and will spring back.
Sectioning and reinforcement where required. Where a rail is cracked, kinked past recovery, or corroded through, that section is cut out and replaced. Welding on a chassis is done to structural standard, not to appearance.
Final measurement. Back on the rack, re-measured against the same reference points, compared against the pre-repair sheet. You get both.
Reassembly and road test. Body back on, systems reconnected, tracking verified under load.
What it costs
| Job | Typical range | Labor hours |
|---|---|---|
| Minor pull, single plane | $3,000 to $6,500 | 15 to 30 |
| Multi-plane pull with measurement | $6,500 to $12,000 | 30 to 55 |
| Pull with rail sectioning and welding | $10,000 to $18,000 | 45 to 90 |
| Structural repair inside a full collision rebuild | Quoted within the collision scope | Varies widely |
Mechanical and structural labor is $260 per hour. Body labor for the teardown and reassembly around the pull is $210. Full posted rates are on the pricing page.
The wide range is not evasion. A single-plane pull on an exposed truck chassis and a diagonal twist on a Class A with the body in the way are different jobs that share a name.
Vehicles we straighten
Class A gas and diesel pusher chassis, Super C and Class C cutaways, fifth wheel and travel trailer frames, toy hauler frames that have been overloaded, semi tractors and flatbeds, box trucks including those with lift gates that have loaded the rear beyond rating, refuse and utility bodies, school and transit bus chassis, and Sprinter, Transit and ProMaster van frames.
We also see a steady flow of vehicles used in heavy towing where the frame has taken cumulative rather than sudden damage. That presents differently: no single event, just a chassis that has slowly gone out of specification and a vehicle that has never driven quite right since.
Previous improper repair
A meaningful share of the frame work here is correcting somebody else's. The pattern is consistent. A shop without a rack pulls a frame with a come-along or a wrecker, gets it visually close, and releases it. The steel springs back partway. The vehicle leaves looking acceptable and is out of specification from the moment it does.
The tell is a vehicle that has been chasing a symptom for years. Tires, alignment, a slide that keeps failing, a door that will not stay latched. If you have replaced the same component more than twice, the problem is probably not the component.
We measure first on those, before quoting anything, because the answer is occasionally that the frame is fine and the problem is elsewhere. That is worth knowing too.
Insurance and frame work
Frame damage is where carriers and shops most often disagree, and where documentation decides the outcome. We photograph the chassis before and after, we attach the measurement sheets to the file, and we submit that as the basis for the scope rather than a narrative description.
If your carrier is moving toward a total loss determination and you do not agree, the measurement sheet is the single most useful document you can have. Our insurance section covers how those determinations work and what your options are.
Estimates for frame assessment are $150 and are credited back against an authorized repair. If the chassis needs to go on the rack to answer the question properly, we will tell you before you commit.