1985 Autocar — we work on any truck
If it runs diesel and needs help, we'll show up. Age is not a barrier — classic, vintage, or modern.
Mobile Commercial Trailer Repair
Commercial Trailer Repair in Charleston, SC — We Come to the Trailer.
A down trailer holds up a load and a tractor. We come to your yard, dock, or jobsite and repair trailer brakes and ABS, lights and 7-way wiring, landing gear, air lines, doors, and floors on-site — on dry vans, reefers, flatbeds, and dumps — so you can hook up and roll.
- Brakes/ABS, lights & 7-way, landing gear, air lines, doors, and floor
- Dry vans, reefers, flatbeds, and dumps repaired where they're parked
- Serving Charleston, North Charleston, Summerville, Goose Creek, Mount Pleasant
What We Repair
The trailer systems that take you out of service
Brakes & ABS
Trailer brake adjustment, linings, drums, chambers, air leaks, and ABS sensor, modulator, and wiring faults that light the lamp.
Lights & 7-way wiring
Dead markers, tails, brake and turn lamps, corroded 7-way plugs, chafed harnesses, and ground faults traced and repaired.
Landing gear & air lines
Bent, seized, or damaged landing gear and legs, plus leaking air lines, glad hands, and fittings that won't hold air.
Doors, floor & body
Swing and roll-up doors, hinges, tracks, seals, and floor and cross-member repairs to keep the box sound and secure.
Why Call Us
A parked trailer ties up a tractor and a load
A trailer with a dragging brake, dead lights, an ABS lamp, or seized landing gear can't be dispatched — and it pins a tractor and a driver with it. Hauling a trailer to a shop for a wiring or brake problem is slow and often unnecessary, because most trailer faults can be traced and fixed right in the yard.
Lowcountry Diagnostics comes to the trailer, tests the brakes, ABS, wiring, and air system, and repairs what failed on-site. You get a clear answer and a trailer that's back in service and inspection-ready, without moving it off the lot.
Why operators call us
- Mobile service where the truck is sitting
- Testing before parts replacement
- Clear written findings and next steps
- Commercial diesel and fleet-focused support
- 24/7 Charleston-area availability
How We Work
What happens when you call
1. Tell us the trailer & fault
Trailer type, what's wrong — brakes, ABS, lights, air, landing gear, or doors — and its location point us to the right first checks.
2. We come to the trailer
Yard, dock, drop lot, or jobsite across the Charleston area — no need to hook up and haul a down trailer to a shop.
3. Test brakes, ABS & wiring
We check the air system, brakes, ABS, 7-way, and lighting circuits to isolate the real fault instead of swapping parts.
4. Repair on-site
Brakes, ABS components, wiring, air lines, landing gear, doors, and floor repairs are handled where the trailer sits when practical.
5. Verify & inspection-check
We confirm lights, brakes, and air hold, so the trailer is back in service and ready to pass a DOT check.
6. Keep the fleet loaded
Fleets get priority and drop-lot scheduling so one down trailer doesn't strand a tractor and a load.
Need commercial trailer repair in the Charleston area?
Call or text Lowcountry Diagnostics and we will come to the trailer.
Common commercial trailer repair questions
What trailer repairs do you handle on-site?
Trailer brakes and ABS faults, lights and 7-way wiring, landing gear, air lines and glad hands, door and hinge repairs, and floor and cross-member issues on dry vans, reefers, flatbeds, and dumps, repaired where the trailer is parked.
Can you fix a trailer ABS light or brake problem?
Yes. We read the trailer ABS system, test sensors, modulators, and wiring, and repair brake, air, and ABS faults. A trailer ABS lamp that stays on is also a DOT concern, so we get it diagnosed and corrected.
My trailer lights or 7-way aren't working — can you help?
Yes. Trailer lighting and 7-way problems are usually a bad plug, corroded pins, chafed wiring, ground faults, or failed lamps. We trace the circuit and repair the wiring so all the required lights work.
Do you repair landing gear and trailer doors?
Yes. We repair and replace landing gear and legs, and fix swing and roll-up doors, hinges, tracks, and seals, along with air lines, floors, and cross-members, on-site across the Charleston area.
Request Trailer Repair
Tell us the trailer type, what's wrong, and where it's parked. We'll come out and get it back in service.
Trailer holding up a load right now? Call or text (843) 310-0995.
Recent Repair Photos
A look at the repairs we make
Real field photos from Lowcountry Diagnostics — from engine diagnostics and electrical to hydraulic, HVAC, and heavy-duty truck service, handled on-site across the Charleston area.
Reviews