A trailer safety inspection is a hands-on check of the brakes, bearings, tires, lights, suspension, frame and coupler that tells you what shape a trailer is in before you tow it. Keep Them Rolling Trailer Repair does these inspections where the trailer is parked, across Morris, Sussex, Warren and Hunterdon counties, for used trailer buyers and owners alike. Call (973) 651-1045.
With 30+ years of trailer work behind him, owner Brad Smith knows that the problems worth worrying about rarely show from the driveway. A race with a pit in it, a spring leaf cracked under the pack, a crossmember rusting from the top down where the deck hides it: an inspection gets eyes and hands on those parts before a load does.
When an inspection is worth it
Before you buy a used trailer
A private sale is usually as-is. A pre-purchase inspection before money changes hands tells you whether the trailer needs routine parts, major running gear work or a pass. It also gives you something concrete to negotiate with if the bearings are dry or the tires are ten years old.
Before the boating or hauling season
Boat trailers sit all winter and then get dunked on the first warm weekend. Landscaping and contractor trailers go from parked to fully loaded in a week each spring. A seasonal inspection catches the dry bearing or dead brake magnet before the busy weeks, when a breakdown costs the most.
After a long storage period
Months of sitting do their own damage. Tires flat-spot and crack, brake drums rust, grease settles and seals dry out, and mice move into junction boxes and chew wire. A trailer that ran fine when it was parked may not be safe to pull when it comes back out, so a safety check after storage belongs before the first trip back, not after it.
Before a long trip, or after a hard hit
Hundreds of highway miles at speed load bearings and tires far harder than local runs do. And a trailer that dropped into a pothole, clipped a curb or took a jackknife can hide a bent axle or cracked weld that only a close look will find.
What the inspection covers
Brad works around the trailer in the same order every time so nothing gets skipped:
- Wheel ends. Each wheel comes off the ground so he can rock it at 12 and 6 o’clock for play and spin it to listen for rumble or grinding. Grease on the inside of the wheel or the brake backing plate points to a failing seal.
- Brakes. Operation from the tow vehicle’s controller, shoe and magnet wear on electric brakes, fluid and actuator on surge brakes, and the breakaway switch.
- Tires and wheels. Tread, sidewall cracks, date codes, bulges, matching sizes and load ratings across each axle, bent rims and loose lugs.
- Suspension and axles. Spring leaves, shackles, bushings, hangers, U-bolts and any sign the axle has shifted or bent, which often shows up first as uneven tire wear.
- Lights and wiring. Every lamp from the plug, the ground connection, and the wire runs for splices, chafing and corrosion.
- Frame and tongue. Welds, crossmembers, rust scale and any repairs that were painted over.
- Coupler and safety gear. Latch, socket wear, the ball size marking, chains, hooks and the jack.
- Body on enclosed trailers. Soft spots in the floor, a sagging or hard-to-lift ramp door, worn hinges and latches, roof seams and seals.
What you get at the end
You get a plain list of what Brad found, sorted into what needs attention now, what should be done before the season and what can wait. Repairs are quoted honestly, and nothing gets touched until you say go. Plenty of fixes can happen on the spot if you want them, such as brake adjustment, lamp and wiring repair or a tire swap. Worn bearings are one of the most common findings, and wheel bearing service and repacking usually happens on the same visit. Bigger parts get ordered for a return trip.
Boat owners who launch on the lakes in Sussex and Morris counties often pair a pre-season inspection with the checks described on the boat trailer repair page. Brad covers trailer repair in Sussex County along with Morris, Warren and Hunterdon, and because the inspection is part of his mobile trailer repair service, the trailer never has to be towed anywhere to get looked at.
Safety inspections are one of Brad’s inspection and maintenance services. A commercial trailer facing its annual inspection needs DOT inspection prep instead, since the checklist and the stakes are different. To book a look at your trailer, request an inspection online.
Common questions
What should I check before buying a used trailer?
Start with the paperwork. The VIN plate should be present and match the title, since a missing plate can complicate titling and registration. Then check the frame and tongue for cracks and painted-over rust, jack each wheel up to feel for bearing play, look for uneven tire wear that points to a bent axle, test every light and try the brakes. If the seller won’t let you look underneath, treat that as your answer.
What should I inspect on a trailer before a long trip?
Check tire pressure cold, read the date codes and torque the lug nuts. Make sure every light works with the tow vehicle connected. Confirm the coupler is latched and pinned, the chains are crossed under the tongue and the breakaway cable is clipped to the tow vehicle, not to the chains. Test the brakes at low speed in a lot. At the first stop, hold the back of your hand near each hub: warm is normal, too hot to touch is not.
How do I check trailer bearings for wear?
Jack the wheel off the ground, grab the tire at the top and bottom and rock it. A clunk or visible movement means loose or worn bearings. Spin it slowly and listen; grinding or a rough, notchy feel means damage. After a drive, compare the hubs: one that’s far hotter than its neighbors is telling you something. Pulling the hub is the only sure way to see the races and rollers, where pitting, blue heat marks or milky grease mean replacement.