Enclosed Cargo Trailer Skin, Roof and Door Repair

Because it is thin and it spans a long way. Cargo trailer skin is typically a light gauge aluminium sheet fixed to vertical posts spaced anywhere from sixteen to twenty four inches apart, either screwed at the seams or bonded on premium trailers. Between the posts there is nothing behind the sheet at all.

Push on that unsupported area and it deflects. Hit it with a forklift tine, a loading dock or a low wall and it tears rather than dents, because the sheet has no crown, no stiffness and no backing. A tear then propagates along the panel until it reaches a seam.

Repair depends on the fixing method. On a screwed trailer, panels are individual sheets between seams and one can be replaced. On a bonded trailer, the skin is a large continuous panel adhered to the posts, and repair means either a let in section with a bonded joint or replacing a much larger area. Wall and roof skin replacement is posted at $1,000 to $15,000 across 8 to 60 hours.

Most enclosed trailers use a single aluminium sheet across the whole roof, rolled over the side rails and fixed at the perimeter with a trim rail and sealant. There is no seam in the field, which is why these roofs work well, and everything that can go wrong happens at the edges and the penetrations.

The trim rail sealant is the usual culprit. It is a long bead exposed to full sun on a horizontal to vertical transition, and it hardens and cracks. Water then travels along the rail and enters at whatever low point it finds, which is rarely near where the sealant failed.

Vents, roof mounted lights and any accessory somebody added later are the other route in. Roof recoat and reseal is posted at $750 to $4,500 across 4 to 20 hours, roof vent and fan replacement at $250 to $1,200 across 1 to 5 hours, and where the sheet itself is damaged, skin replacement applies. See roof repair.

Differently depending on which type the trailer has, and both wear faster than owners expect because the door is used every single time the trailer is used.

Ramp door

Hinged at the floor, supported by cables, latched at the top. Cables fray, anchors elongate, hinge pins wear, the door sags, and the latches are then asked to pull it closed. Spring assist failure accelerates the whole sequence.

Barn doors

Two vertically hinged doors with cam bars. Hinges sag under door weight, cam bar keepers wear, and the doors stop meeting in the middle. Seal failure at the centre joint follows.

Side door

Small, used constantly, and mounted in a wall that flexes. Hinge screws work loose in the post, the latch stops aligning and the door starts needing a shove.

Roll up door

Slats, track, spring barrel and seals. Bent slats bind in the track, and a spring barrel out of balance makes the door heavy and hard on everything else.

Cargo door, ramp door and roll up door service is posted at $400 to $5,500 across 2 to 22 hours, barn door service at $300 to $2,500 across 1 to 10 hours, and roll up and swing door service at $400 to $4,500 across 2 to 18 hours.

A great deal, which is why so many arrive here as build projects rather than repairs. The shell is a blank box with a flat floor, a door big enough for anything and a chassis already rated for weight.

Common conversions: mobile workshops, race support trailers, vending and retail units, tool and equipment carriers, and living quarters. All of them need the same foundations done properly first, which is insulation, wall structure to anchor into, a floor that will take the use, and an electrical system sized for the load.

Interior build out and conversion is posted at $2,500 to $50,000 across 20 to 250 hours. Insulation and sound deadening runs $750 to $4,500 across 4 to 20 hours, cargo shelving and racking install $750 to $7,500 across 4 to 30 hours, and cargo floor and liner install $400 to $4,500 across 2 to 18 hours. Request a Quote to discuss a build.