Mobile Trailer Repair in Charleston, SC — Liftgates, Lights & Roll-Up Doors

A trailer problem strands a load just as fast as an engine problem, and most shops won’t touch a trailer that isn’t already in their yard. Fleet Doc works on trailers where they sit — on the shoulder of I-26 or I-95, at a dock, or in your yard — across Charleston, Berkeley, Dorchester and Orangeburg counties.

Trailers fail in ways tractors don’t. A lighting fault that fails a roadside inspection, a liftgate that won’t lift with a full load behind it, a roll-up door jammed half open, an air line rubbed through on a landing gear brace. None of those need a tow. They need somebody with the right parts and a service truck, standing next to the trailer.

We are a heavy-duty mobile operation, so trailer work runs the same way the rest of our service does: the job is quoted before we start, parts are billed separately, and fleet accounts can run on contract terms.

Trailer work we do on site

• Trailer lights and wiring — dead marker lights, brake and turn faults, corroded 7-way plugs, chafed harnesses, ground faults, nose-box repairs. The most common reason a trailer gets written up at a weigh station.
• Liftgate repair — hydraulic leaks, pumps and motors that won’t run, bent or binding platforms, control switches, solenoids, and the battery and charge-line problems that cause most "liftgate is dead" calls.
• Roll-up and swing door repair — jammed or derailed roll-up doors, broken springs, damaged panels and tracks, hinges, latches and door seals.
• Trailer air systems — blown air lines, gladhand and coupling leaks, spring brake and air-bag faults on the trailer side.
• Trailer brakes and wheel ends — shoes, drums, slack adjusters, hubs, seals, studs and wheel-end work — see truck brake repair.
• Trailer tires — blowouts and roadside replacement, covered on our mobile tire service page.
• Landing gear, suspension and structural — bent or seized landing gear, broken crank handles, air-ride and spring suspension faults, mud flaps and brackets.

A recent example from the corridor: a trailer tire replaced on a loaded car hauler at the I-26/I-95 junction, with the deck still loaded and no tow involved.

Box trucks and straight trucks get the same treatment. Liftgates and roll-up doors are box-truck specialties that most mobile outfits skip, and they are two of the services we get called for most.

Where we come to you

Our coverage runs the I-26 corridor from the Port of Charleston to the I-95 junction, plus the I-95 stretch through Santee, St. George, Bowman, Harleyville and Holly Hill. If you are stopped right now, call and give dispatch your interstate, direction of travel, and the nearest exit or mile marker — that is how we route the truck. Full detail on the service areas page, and for a general breakdown see roadside truck repair.

Most Charleston metro calls are 30–60 minutes. Ridgeville and Harleyville run 45–60. St. George and the junction are about an hour. Santee and Orangeburg are 60–90 depending on traffic and time of day. After-hours calls are answered by a person, not a voicemail.

What to have ready when you call

• Trailer number and, if you have it, the VIN.
• Whether the trailer is loaded, and roughly how heavy.
• For lights: which lamps are out, and whether the fault follows the trailer to a different tractor.
• For liftgates: does the pump run and nothing moves, or is it completely dead with no sound at all? Those are two different repairs.
• For doors: whether the door is stuck open or closed, and whether the load is accessible.
• Your exit number or mile marker, and whether you are on the shoulder or somewhere we can work safely.

Trailer repair questions we get

Do you work on trailers that aren’t attached to a tractor?

Yes. Dropped trailers in a yard or at a dock are routine for us, and it is often the easiest kind of job to schedule because there is no driver sitting and waiting. Tell dispatch where the trailer is parked and how to get to it.

My liftgate stopped working. Is that a gate problem or a truck problem?

More often than people expect, it is a power problem rather than a gate problem — a dead or undercharged liftgate battery, a corroded ground, or a charge line that stopped charging off the truck. That is why we ask whether the pump makes any noise. If the pump runs but the platform doesn’t move, it points at hydraulics. If it is silent, it usually points at power. Either way we carry what it takes to test both.

Can you fix trailer lights well enough to pass a DOT inspection?

That is most of the trailer lighting work we do. Lighting violations are one of the most common out-of-service write-ups on the I-26/I-95 corridor, and they are usually a connector, a ground or a chafed harness rather than the lamps themselves. We repair the cause rather than swapping bulbs until it works. See fleet & DOT inspections if you need the inspection itself.

My roll-up door is jammed and I can’t get to the freight. Can you come out?

Yes, and it is worth calling before forcing it. A door that has come off its track can usually be re-seated and repaired; a door that has been forced often turns into panel and track replacement instead. If the load is time-sensitive, say so when you call.

Do you carry trailer parts on the truck?

We stock the common failure items — lamps, connectors, wiring, air line and fittings, gladhands, seals and common wheel-end hardware. Liftgate and door parts vary widely by make, so for those we diagnose first and then source the specific part. Parts are billed separately from labor.

Do you do heavy-duty only, or box trucks too?

Both. Heavy-duty tractors and trailers are our core work, and box trucks and straight trucks are squarely in scope — liftgates and roll-up doors especially. What we don’t do is light-duty passenger vehicle work.