RVs and Motorhomes
Super C Motorhome Repair for San Clemente Owners
Short answer
A Super C puts an RV house on a medium duty truck chassis. The house and the commercial cab fight each other at the transition, and cab paint matching is its own job.
Super C repair at OCRV Center covers medium duty chassis measurement, cab to house transition rebuilding, heavy slide and leveling service, fiberglass and laminated body work, and paint matching between a commercial cab and an RV house. All work is done in shop in Yorba Linda.
Updated 2026-07-29 by OCRV Center Editorial Team
A Super C exists because owners wanted diesel pusher towing capacity without a pusher price or a pusher driving position. What they got is a Freightliner M2, an International MV, a Ram 5500 or a Kenworth chassis with a conventional cab, carrying an RV house that is often 40 feet long and 20,000 pounds heavier than what a normal Class C carries. That combination creates loads at the cab to house transition that a standard Class C never sees, and it is where these coaches show their damage.
The other complication is finish. The cab left the truck plant in a commercial paint system. The house was built and finished by an RV manufacturer using a different base, different clear and often a different sheen. Matching a repair across that boundary is not a color read problem, it is a system compatibility problem, and getting it wrong shows up as a visible line at the transition under direct sun. We plan those repairs to a natural break rather than blending across two paint systems.
What Fails on This Class, and Where
These are the specific failure points we see on this build type, not general advice that applies to every coach on the road.
- Cab to house transition boot tearing
- The flexible closure between the truck cab and the RV front wall works through every degree of frame twist. Once it tears or its retaining strip pulls, water drives straight into the front wall cavity and travels down inside the wall to the floor.
- Body mount isolator collapse
- Rubber isolators between the medium duty rails and the house floor take a beating under a heavy 40 foot house. Collapsed isolators let rail twist go straight into the laminated structure, which then cracks interior trim and racks slide openings.
- Full wall slide timing drift
- Full wall slides on hydraulic or heavy rack and pinion systems drift out of side to side timing once the opening loses square. The room stops short on one corner, the wiper seal rolls, and the room face begins scuffing the sidewall on every cycle.
- Visible paint line at the cab to house boundary
- Truck plant clear and RV builder clear chalk at different rates in Southern California sun. Any repair that blends across the boundary shows a line under raking light within a season, which is why scope has to stop at a designed break.
- Rear frame extension weld cracking
- Long rear overhangs with a hitch rated for a large tow vehicle load the extension splice as a cantilever. Cracks start at the weld toe on the bottom flange, and the first symptom is a rear end that sits low and moves independently over dips.
The Medium Duty Chassis and the House Transition
A medium duty truck frame is a straight rail ladder designed to carry a vocational body that bolts on through spring loaded or rubber isolated mounts. RV builders use those same mounts but hang a laminated house on them, and the house has almost no torsional tolerance compared with a dump body or a service bed. When the rails twist over uneven ground, the mounts absorb some of it and the house absorbs the rest. Over years, that shows up as cracked interior trim, drifting slide timing and separation at the front wall corners.
On any Super C that comes in after a collision, we measure the rails against chassis specification, check every body mount for correct torque and isolator condition, and verify that the house has not shifted relative to the cab. That last check matters because a shifted house changes the gap at the transition boot, and the boot is the only thing keeping water out of that joint. A repair that restores panel appearance without restoring the mount positions leaves the coach leaking at the one place nobody inspects.
- Frame rail measurement
- Straight rails with published dimensions from the chassis manufacturer. Deflection reads first as steering pull and uneven front tire wear, then as slide timing drift as the house is forced out of square.
- Body mount isolators
- Rubber or spring isolators between the rails and the house floor structure. Collapsed or missing isolators transmit full rail twist into a laminated box that cannot absorb it.
- Cab to house transition boot
- A flexible boot or sealed panel closing the gap between a truck cab and the RV front wall. It has to move constantly, and it is the primary water path once it tears or the gap changes.
- Rear frame extension
- Extensions carrying the rear of a long house behind the axle, often with a heavy hitch. Weld toe cracks at the splice are common on high mileage coaches and get missed at routine service.
What Extra Weight Does to Slides and Leveling
Super C houses tend to run big slides, frequently full wall on the driver side, and those slides are heavy. Most run hydraulic rams or heavy rack and pinion rather than the in-wall systems you find on lighter coaches. The mechanism itself is robust, but it is referenced to an opening that has to stay square. Once the house has taken chassis twist for a few years, or once a collision has racked the opening, the two sides of the slide stop moving at the same rate and the mechanism starts fighting itself.
The symptom owners report is that the slide is slow, or that it stops short on one corner, or that the seal is dragging. The fix is not to adjust the mechanism until it works. The fix is to check whether the opening is square, correct it if it is not, and then re-time the mechanism and reset the stops. Leveling comes into the same conversation, because owners routinely operate slides on a coach that is not level, which loads the opening in exactly the direction it is weakest.
Matching Paint Across a Truck Cab and an RV House
The cab on a Super C carries a commercial paint system applied at a truck plant with high bake schedules and a specific clear. The house behind it was finished by an RV builder, often with full body paint over a fiberglass substrate and a different clear chemistry. Even when the color code is nominally the same, the two panels reflect light differently because the substrates and the clear are different. Blend across that line and you will see it in raking afternoon sun on the drive home.
Our approach is to refinish to a designed break. If the damage is on the cab, we finish the cab as a unit. If the damage is on the house, we finish the affected house panel run to the transition. Where a graphic crosses the boundary, we reproduce it on both sides rather than trying to blend one into the other. We read color with a spectrophotometer on both substrates separately and spray test cards on the same substrate the repair will land on, not on a generic panel.
- Two clear coat systems
- Truck plant clear and RV builder clear age differently and reflect differently. Chalking on one side of the transition and not the other is the most common reason an old repair suddenly looks wrong.
- Substrate difference
- Steel or aluminum cab panels against gel coated fiberglass house panels. The same color code lays down differently on each, so spray-out cards go on matching substrate before the coach is touched.
- Graphics crossing the boundary
- Many builders run a graphic from the cab door onto the house side. We document it with measured photographs and reproduce it on both surfaces rather than attempting an invisible splice.
- Designed refinish break
- Scope is set to a natural body line, the transition itself or a panel edge. That decision is made before the estimate goes out, because it drives the number more than the damage does.
What Super C Work Costs
Body and paint labor is $210 per hour, mechanical and electrical is $260 per hour and diagnostics are $285 per hour with a one hour minimum credited to the repair. Truck collision and paint work runs $1,500 to $50,000 and up. RV collision on the house side runs $1,000 to $150,000 and up. A Super C claim often includes both, which is why the estimate arrives as two clearly separated sections rather than one number.
Parts lead time behaves differently here too. Cab sheet metal and lighting for a Freightliner M2 or an International MV is generally available through commercial channels in days. House components, molded caps and painted bay doors from an RV builder can run months, and on discontinued models they may not exist at all, in which case we fabricate. We tell you which parts fall into which bucket at the time we write the plan, so the schedule you get is the real one.
What This Costs at Our Posted Rates
Body and paint labor is posted at $210 per hour. Mechanical and electrical is $260 per hour. Diagnostics run $285 per hour with a one hour minimum that is credited back against an authorized repair. Ranges below reflect jobs we have actually completed.
| Line item | Range | Hours |
|---|---|---|
| Super C collision repair, house side | $1,000 to $150,000+ | 5 to 800 |
| Truck collision and paint, cab and chassis side | $1,500 to $50,000+ | 7 to 240 |
| Full paint refinish | $5,000 to $35,000+ | 40 to 250 |
| Slide mechanism service, full wall room | $500 to $8,500+ | 2 to 34 |
| Delamination repair, sidewall or front wall | $1,500 to $20,000+ | 10 to 100 |
Ranges reflect real jobs we have run. Final figures come from a written estimate after we see the vehicle.
See the full rate card and estimate policy.
What Is Included
- Chassis rail measurement against Freightliner, International or Ram specification
- Body mount and isolator inspection with torque verification
- Cab to house transition rebuild and resealing
- Frame extension weld inspection and repair
- Heavy slide opening squaring, re-timing and stop reset
- Fiberglass cap and laminated sidewall repair on the house
- Separate color reads and spray-outs for cab and house substrates
- Graphic documentation and reproduction across the transition
Questions We Get Asked
Why does my Super C need a bigger paint job than the damage suggests?
Because the cab and the house wear different paint systems over different substrates, and they age differently. Blending a repair across that boundary produces a visible line under raking sun within a season. We set the refinish scope to a designed break, which means a cab hit gets the cab finished as a unit rather than a partial panel blend.
My full wall slide stops short on one corner. Is the motor failing?
Usually not. It is nearly always an opening that has lost square, either from years of chassis twist or from an impact. Adjusting the mechanism to compensate hides the problem and wears the seal. We check opening squareness first, correct it, then re-time the mechanism and reset the stops so both sides travel together.
Do you handle both the truck side and the RV side of a Super C claim?
Yes, and we write them as separate sections on the estimate so your adjuster can see which labor and parts belong to the chassis and which belong to the house. Body and paint is $210 per hour and mechanical and electrical is $260 per hour. Cab parts usually arrive in days, house parts can take months.
How far is Yorba Linda from San Clemente for a coach this size?
About 45 minutes up the I-5 or the 73. Our facility is 35,000 square feet with bays sized for 45 foot coaches, so length and height are not an issue. Everything is done in shop. We do not run mobile or roadside service for any vehicle class.