Mobile Office Van and Trailer Body Repair
Written by Fleet Account Manager, Fleet and Commercial Account Manager, OCRV Center. Reviewed by RV Systems Lead
In shortAn office build cuts three to five windows into one body side and then bolts furniture to the floor. The result is a body that racks, so doors stop closing square first.
What goes wrong on a mobile office build?
Mobile office repair deals with window headers cut into a body side, sidewall HVAC penetrations, shore power inlet enclosures and floor mounts under bolted furniture. Rancho Santa Margarita operators bring vans, box bodies and office trailers to our Yorba Linda shop, where the structural and electrical work is done together.
- Every window aperture removes shear from that body side
- A wall mounted HVAC unit wets the panel behind it
- Shore inlets and panel enclosures collect water at the flange
- Bolted desks and racks tear thin floor sheet, not fasteners
- Base platform
- High roof Transit, box body on a cutaway, or a towed office trailerUpfits from Adrian Steel and Ranger Design are common
- Typical length
- 20 to 30 feetGVWR 9,600 to 19,500 lb
- Structural rate
- $210 per hourApertures, headers, floors and refinish
- Electrical rate
- $260 per hourShore inlet, distribution panel and circuits
- Deposit policy
- 50 percent over $2,000Additional 25 percent at parts arrival over $10,000
- Written estimate
- $150Credited in full against an authorized repair
Last verified
An office build is the quietest vehicle in this family and the one whose structural problems are hardest to spot. Nothing inside it is heavy in the way a fryer or a bathing tub is heavy. What it does instead is remove structure: three, four, sometimes five window apertures cut into one side of a body so people inside can see out and the space does not feel like a container.
Each of those apertures needs a header and jambs put back. When they are light, the body starts to rack rather than resist, and the first thing anybody notices is a door that has to be lifted slightly to latch. That is the symptom we chase on these units, and it is almost never the door.
An office build subtracts structure rather than adding weight
Every other unit in this family loads a body. An office build unloads it. Nothing inside weighs much on its own, but the fit out cuts three to five window apertures into a single side so that people working in there can see daylight, and then puts a residential style door into the same wall. What is left between the openings are short piers of panel.
Builders size the headers over those openings for the weight of the glass, which is the easy calculation. The harder one is shear, because the removed panel was tying the tube posts together and stopping the body racking as the chassis moves. That calculation is the one that gets skipped, and the bill arrives five years later.
- Three or more apertures in one side leaves very little shear panel
- Headers are usually sized for glass weight rather than racking
- A rigid framed entry door has no tolerance for an out of square aperture
- Trailer builds have no chassis stiffness helping them at all
How to tell a racking body from a bad door
The complaint is always the same: the door needs a lift to latch. Before we touch a hinge we go along the outside of that wall and look at the glazing rubbers. If the rubber has squeezed proud at the same top corner of every window in the wall, the side has racked and each aperture has gone out of square in the same direction. One door out of square with straight glazing is a door problem.
Then we measure. Aperture diagonals on every opening in the wall, floor to header at both jambs, and the same set on the opposite side of the body for a reference. Numbers that walk progressively along the wall confirm racking. At that point the repair is headers and jambs, not planing a door edge and moving a striker.
- Sight every glazing rubber in the wall from outside before opening anything
- Measure aperture diagonals on all openings in that side
- Repeat the measurements on the opposite side as a reference
- Reinforce headers and jambs before refitting glass or adjusting the door
The HVAC penetration and the lining behind it
People sitting still need more cooling than people moving around, so office builds add a wall mounted split or a through wall unit rather than relying on a roof unit alone. That is a large rectangular hole through skin, insulation and interior panel, and it carries a condensate path that has to leave the body with a reliable fall.
Get the fall wrong, or let the drain silt up, and the condensate runs inward instead. The lining stays damp for a whole cooling season and the panel behind the unit delaminates quietly. We check the drain fall with the unit running before we replace any panel, because a new lining over a bad drain slope is a repair with a known end date.
Shore inlets and enclosures that fill with water
A site office lives plugged into a pedestal outdoors, and the inlet sits low on a body side where wheel spray and hose water both reach it. Behind that inlet is an enclosure holding the main breaker and usually a surge device, and its own gasket is often the only thing keeping weather out of a live box. Nobody opens it for years, because there is no reason to until something stops working.
Water pools in the bottom of the enclosure and corrodes terminations from underneath, which produces intermittent faults that read exactly like a failing breaker. Replacing the breaker buys a few months. We rebuild the flange with a drain path so water cannot stand in it, gasket the enclosure properly, and then inspect and retorque every termination in the box rather than swapping whichever device happened to fail first.
Bolted furniture and the floor under it
Furniture in a moving office has to be fastened down, and that concentrates load. A conference table, a document wall or a small equipment rack puts two or three hundred pounds on four fasteners, and in a trailer floor of three quarter plywood over widely spaced cross members those fasteners crush the ply around themselves.
Once a mount loosens, the assembly starts to work the floor on every journey and the hole grows. The repair is backing plates that spread the load and, where the layout allows, relocating a mount over a cross member instead of between two. We map where the members actually run before we drill anything new.
Doors, thresholds and the step everyone stands on
The entry on an office build gets used far more than an RV door and it carries a threshold, a step and often a grab handle bolted through the body side. Each of those is a fastener group in a panel that is already short of shear, and the step in particular takes an impact load every time somebody steps up rather than climbs.
We treat the door aperture as structure. That means squaring the opening, reinforcing the jamb the hinges hang on, backing the grab handle into a post rather than into bare skin, and mounting the step to floor structure rather than to the panel below the threshold. Only then does the door go back, shimmed to the corrected aperture and set so the latch engages without anyone lifting it.
In shop scheduling and what the departments bill
We are not set up for mobile repair work and there is no roadside option, so an office unit comes to Yorba Linda. Welding a header, resetting fixed glass and refinishing a body side are all building jobs, and the interior has to be dismantled to reach the inside of the wall anyway. Rancho Santa Margarita site offices reach us on the 241 to the 91.
Structural, floor, panel and refinish hours bill at $210 with body supplies at $5 per body hour. Shore power and circuit work bills at $260. A written estimate is $150 credited in full against an authorized repair, and on a job over $2,000 a fifty percent deposit is taken at authorization with a further twenty five percent when parts arrive past $10,000.
How a mobile office is built
| System | What it is |
|---|---|
| Wall system | Either a high roof van body with an insulated interior lining, or a box body of FRP or aluminum skin over tube posts, or a purpose built office trailer, each with multiple fixed windows cut into a body side and a residential style entry door |
| Roof system | Flat aluminum or FRP roof with a rooftop air conditioner on a curb, a ducted plenum where the layout allows it, and cable penetrations for network and satellite hardware |
| Chassis | Ford Transit 350 or a cutaway chassis under a box body, or a single or tandem axle office trailer, fitted out with a desk run, a conference table, a document wall and a distribution panel fed from a 30 or 50 amp shore inlet |
| Typical length | 20 to 30 feet |
| Typical GVWR | 9,600 to 19,500 lb |
What typically goes wrong on this vehicle
Window header deflection and body racking on a multi aperture side
Three or more windows in one body side leave short piers of panel between long openings, and each header has to carry what the removed panel was carrying. Office builders size those headers for the glass weight rather than for shear, so the side gradually racks. The classic evidence is window rubbers that have squeezed out at one top corner on every aperture in that wall.
How we repair itSidewall HVAC penetration weeping behind the interior lining
An office needs cooling for people sitting still, so a wall mounted split or a through wall unit gets fitted rather than relying on a roof unit alone. That means a large rectangular hole through skin, insulation and interior panel, with a condensate path that has to leave the body. When the drain slope is wrong the condensate runs inward and the lining stays damp all summer.
How we repair itWater standing inside the shore power inlet and panel enclosure
A site office plugs into a 30 or 50 amp pedestal outdoors, and the inlet is mounted low on a body side where wheel spray reaches it. The enclosure behind it houses the main breaker and a surge device, and its own gasket is often the only barrier. Water collects in the bottom of the box and corrodes terminations from underneath.
How we repair itFloor mount tearing under a bolted conference table or equipment rack
Office furniture gets bolted down so it does not walk in transit, and a document wall or a small server rack concentrates two or three hundred pounds on four fasteners. In an office trailer floor of three quarter plywood over widely spaced cross members, the fasteners crush the ply and the mount loosens, then the whole assembly starts working the floor around it.
How we repair itEntry door no longer closing square in its aperture
An office build uses a hinged residential style door with a threshold and a step, set into a body side that has already been weakened by the window openings. As the side racks, the door aperture goes out of square by a few millimetres, and a door with a rigid frame and a mortice latch has no tolerance for that. Users start lifting the handle to latch it.
How we repair itWhat common jobs run on this vehicle
Window header and jamb reinforcement across a body side
$750 to $20,000+
5 to 80 labor hours at $210 per hour, body and paint.
- Body supplies at $5 per body hour.
- Parts at $100 or less carry 100 percent markup. Parts over $100 carry 35 percent. Special order parts require a full non refundable deposit at order.
- Sales tax of 7.75 percent applies to parts and materials. Labor is not taxed.
- A 50 percent deposit is taken at authorization on any job over $2,000, with an additional 25 percent when parts arrive on any job over $10,000. Final balance is due at pickup.
- One header gusseted and one window reset sits at the bottom. Reinforcing four apertures and resetting all the glass runs well up the band.
HVAC penetration reseal and interior lining replacement
$500 to $5,500
3 to 22 labor hours at $210 per hour, body and paint.
- Parts at $100 or less carry 100 percent markup. Parts over $100 carry 35 percent. Special order parts require a full non refundable deposit at order.
- Sales tax of 7.75 percent applies to parts and materials. Labor is not taxed.
Shore inlet and distribution enclosure rebuild
$285 to $5,500+
1 to 22 labor hours at $260 per hour, mechanical and electrical.
- Parts at $100 or less carry 100 percent markup. Parts over $100 carry 35 percent. Special order parts require a full non refundable deposit at order.
- Sales tax of 7.75 percent applies to parts and materials. Labor is not taxed.
Floor repair and mount backing under bolted furniture
$750 to $9,500+
6 to 40 labor hours at $210 per hour, body and paint.
- Parts at $100 or less carry 100 percent markup. Parts over $100 carry 35 percent. Special order parts require a full non refundable deposit at order.
- Sales tax of 7.75 percent applies to parts and materials. Labor is not taxed.
- A 50 percent deposit is taken at authorization on any job over $2,000, with an additional 25 percent when parts arrive on any job over $10,000. Final balance is due at pickup.
Entry door aperture squaring and door refit
$2,000 to $12,000+
10 to 55 labor hours at $210 per hour, body and paint.
- Parts at $100 or less carry 100 percent markup. Parts over $100 carry 35 percent. Special order parts require a full non refundable deposit at order.
- Sales tax of 7.75 percent applies to parts and materials. Labor is not taxed.
- A 50 percent deposit is taken at authorization on any job over $2,000, with an additional 25 percent when parts arrive on any job over $10,000. Final balance is due at pickup.
Will it fit in the shop?
Office units are undemanding on space and demanding on sequence. A 30 foot box body or trailer takes a standard bay, and the whole unit paints in the booth in one piece. What we plan around is that structural work on a window aperture means the glass comes out, the interior lining comes off, and the desk run in front of it gets dismantled and stored. We photograph and label the interior before any of that happens, and the data cabling gets tagged at every disconnect.
Insurance considerations for this vehicle
- Racking that developed over years is not a covered loss, and neither are the window seals it squeezed out. A single impact that put a side out of square is collision, and the two look similar in a photograph taken after the fact.
- Electronics in an office build are usually excluded from the auto policy and covered by a contents or inland marine endorsement. Confirm which before a loss rather than after a break in or a water event.
- On a towed office trailer, check whether the unit is on the vehicle policy at all. Trailers are routinely left off a commercial auto schedule and then found to be uninsured at the worst possible time.
Appendix: questions and answers
- Our site office door has to be lifted to latch. Is that the hinges?
- Probably not. Look along the outside of that wall at the glazing rubbers. If the rubber has squeezed proud at the same top corner of every window, the side has racked and every aperture has gone out of square together. That is a header and jamb repair. One out of square door with straight glazing is a door repair.
- Is there a limit to how many windows a body side can take?
- There is no fixed number, but every aperture removes shear and the piers left between openings have to carry what the panel was carrying. Three or more in one wall needs headers sized for racking rather than for glass weight, tied into a roof bow above and the floor below. We reinforce to that standard when we repair one.
- The wall around our air conditioner stays damp all summer. Why?
- Almost always the condensate drain rather than the seal. If the fall is wrong or the drain has silted up, condensate runs inward through the penetration and the interior lining never dries. We run the unit and check the drain fall before replacing any panel, because new lining over a bad slope fails again.
- We get intermittent power faults on shore. Where do you start?
- At the bottom of the distribution enclosure, which is usually holding water. The inlet sits low in a body side where spray reaches it, and terminations corrode from underneath, which mimics a failing breaker. We rebuild the flange with a drain path, gasket the box and inspect and retorque every termination in it.
- The conference table mounts keep working loose. Can that be fixed properly?
- Yes, with backing rather than bigger bolts. Two or three hundred pounds on four fasteners crushes three quarter plywood between widely spaced cross members. We fit spreader plates, and where the layout allows we relocate a mount over a member instead of between two. We map the members before drilling anything new.
- What happens to our network cabling while the body is repaired?
- It gets photographed, tagged at every disconnect and stored with the desk run we remove to reach the wall. Structural work on a window aperture means the glass comes out and the lining comes off, so the cabling has to come out of the way. Labelling it at teardown is what makes the reinstall match what you had.
Open a file on this repair
Tell us the vehicle, what happened and whether a claim is open. We will tell you what the scope looks like and what it takes to get you back on the road.
Or call (949) 799-3387