ENCLOSED TRAILER DOOR REPAIR · MOCKSVILLE & THE TRIAD, NC
THE DOOR JOB NOBODY ELSE WANTS.
Call around about a trailer ramp door and you'll hear a lot of "we don't do those." We do. Car haulers, cargo trailers, concession rigs: if it has a door, we work on it.
WHAT WE DO.
- Ramp door spring and cable repair
- Side door hinge and latch repair
- Door alignment adjustments
- Seal and weatherstripping replacement
- Lock mechanism servicing
- Panel repair and replacement
TRAILER DOOR TROUBLE SIGNS.
- The ramp door takes two people to lift because the springs are shot.
- Daylight around the seals, which means water and mice get in too.
- The side door latch needs a shoulder to close, or won't stay shut.
- The ramp slams down instead of lowering under control.
- Rot or soft spots in the ramp decking near the hinges.
An enclosed trailer is a rolling garage, and its doors take a beating a house door never sees: highway vibration, weather from every direction, and a ramp that doubles as a loading dock. When the springs or cables wear out, that ramp becomes genuinely dangerous, because it's heavy and it has nowhere to go but down fast.
We repair the systems trailer dealers usually won't touch once it's off the lot: ramp door spring assemblies, cables, hinges, latches, locks, and the seals that keep your cargo dry and the mice out. For race weekends and car shows, a trailer that opens right is the difference between loading in ten minutes and wrestling it in the dark.
Bring the trailer to us in Mocksville or ask about on-site service. Either way you'll get the same treatment as our garage door customers: straight diagnosis, fair price, fixed right the first time.
A true specialty: most door companies won't touch trailer doors. It's on our truck every week.
HOW TRAILER DOORS WORK.
Ramp door springs
Most enclosed trailer ramp doors use spring assist, usually springs at the hinge or a spring-and-cable setup, to take weight off the ramp as it lowers and lifts. When those wear out, the ramp gets heavy to lift and drops too fast on the way down. That's when people get hurt.
Cables
Ramp cables keep the ramp under control and carry spring tension. They fray at the edges and rust from road spray. A fraying cable should be replaced before it fails with a heavy ramp halfway down.
Hinges and the ramp itself
The ramp hinge takes the full load every time something rolls up it. We repair and replace hinges and look at the decking near the hinge line, where soft spots and rot tend to start.
Side doors and latches
Side doors take a pounding from highway vibration. Hinges loosen, latches stop catching, and locks get stiff. We adjust, repair, or replace the hardware so the door closes without a shoulder and stays shut on the road.
Seals
Worn seals let in rain, road spray, and mice. New seals keep tools, equipment, and race gear dry, and they're one of the cheapest ways to protect what's inside.
What not to do
Don't try to adjust or remove ramp springs yourself; they're under tension even with the ramp closed. Keep everyone clear when lowering a ramp with tired springs, and lower it slowly with two people if you have to use it before it's fixed.
Getting it to us
Bring the trailer to our shop in Mocksville, or ask about on-site service. Send photos of the ramp, the hinges, and the springs when you call so we know what parts to have ready. Shop doors and bays are commercial door service.
Concession and race trailers
Concession and race trailers get opened and closed constantly on event days, often in a hurry and often by more than one person. That's hard on latches, hinges, and ramp springs. A quick inspection before your season starts catches the worn part while there's still time to fix it.
A ramp check you can do
Lower the ramp slowly and watch it. It should come down under control, without a sudden drop near the bottom, and lift without a fight. Look for frayed cables, rusted spring ends, and loose hinge bolts. If anything looks off, stop using the ramp until it's been looked at.
STRAIGHT ANSWERS.
REVIEWED OCTOBER 2026
What kinds of trailers do you work on?
Enclosed trailers: car haulers, cargo trailers, and concession rigs. If it has a ramp door or a side door, we work on it.
My ramp door slams down. Is that dangerous?
Yes. It means the springs or cables are worn and the ramp isn't under control. Lower it slowly, keep people clear, and get the springs looked at before it hurts someone.
Do I have to bring the trailer to you?
You can bring it to our shop in Mocksville, or ask about on-site service when you call.
Why is my trailer ramp so hard to lift?
Almost always worn or broken springs. The springs are supposed to carry most of the ramp's weight. When they wear out, you're lifting the whole ramp yourself, and it will drop just as hard on the way down.
How do I make trailer door seals last?
Keep them clean, check them for cracks each season, and don't drag cargo across them. Once a seal is cracked or flattened, replacing it costs less than water damage inside the trailer.
Can you replace trailer door seals?
Yes. Seal and weatherstripping replacement is a regular part of trailer door work.
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