What are the key parts of a trailer to inspect?
Think in zones: the hitch and coupler, the safety chains and breakaway system, the tires and wheels, the axles and suspension, the brakes, the lights and wiring, the floor and frame, and the doors, gates or ramps. Take your time and write down anything that looks questionable.
Walk around the trailer and look and touch each part. Cracks, rust holes, loose bolts, worn parts and anything that looks bent deserve attention before the trailer goes on the road.
Keep a photo or a card with the trailer's identification number and weight ratings in the truck. You will need them for registration, repairs and ordering parts that fit.
How do I check the hitch and coupler?
Confirm that the coupler matches the ball size marked on it and that the latch closes securely and locks. Look for wear, cracks and rust on the ball, coupler and tongue. Safety chains should cross under the tongue, hold enough slack for turns and attach to the tow vehicle's rated points.
Check that the tow vehicle and hitch are rated for the loaded trailer. The ratings are on labels and in the owner's manuals. Do not exceed any of them.
Grease the coupler and the jack as the manual describes, and make sure the jack works under load before you count on it. A stuck jack is a common reason for a bad hitch-up.
What about tires and wheels?
Tires on a trailer often age out before they wear out because they sit in sun and weather. Check for cracks, bulges, uneven wear and the age code on the sidewall, and replace tires according to the maker's guidance and your tire professional's advice.
Set the pressure to the value the trailer or tire maker states, with tires cold. Torque the wheel nuts to the specification in the manual, and recheck after the first miles following any wheel work.
Carry a spare tire, a jack and a lug wrench that fit the trailer, and check that the spare holds air. Practice changing a wheel at home so you are not learning on a shoulder.
How do I keep the brakes and lights working?
Test the brake controller in the tow vehicle and look for the trailer brakes engaging. Brake components wear and need inspection and adjustment. Bearings need periodic service as the manual describes, and a technician can do it if you are unsure.
Check every light before every trip with a helper: running, brake, turn and hazard lights. Clean and protect the plug and connection, and replace damaged wires. A trailer without working lights is a hazard to everyone on the road.
Replace brake parts in pairs on each axle so braking stays even. Uneven brakes make the trailer pull and wear tires.
What should I look for in the floor and frame?
Wooden floors rot from the underside and from the manure and moisture that sit on top. Probe suspicious spots with a screwdriver, and look from below for soft or dark boards. A weak floor is dangerous for animals and loads.
Look at welds and cross members for cracks and rust. Repair or replace weak parts using a qualified welder, since structural repairs affect safety.
Rubber mats over wooden floors can hide rot. Lift them from time to time and look at the boards beneath, and clean and dry the floor after each haul.
What laws and papers apply?
Registration, inspection, lighting, brake and driver license rules for trailers vary by state and by weight. Ask your state motor vehicle agency or highway patrol what applies to your trailer and tow vehicle.
If you haul livestock, also ask your state department of agriculture or state veterinarian about any health papers or animal movement rules, which vary. Keep registration and insurance documents in the tow vehicle.
Keep a short list of numbers in the tow vehicle: your insurance agent, a roadside service that handles trailers and your veterinarian if animals are aboard.
How should I store the trailer?
Park on firm, level ground, chock the wheels and keep the tongue supported. Cover or shelter the trailer if you can, wash manure out of livestock trailers after each haul and let the floor dry.
Grease and lubricate as the manual directs, and walk around the trailer again before the next use. A quick note of dates keeps maintenance on track.
Before spring and fall hauling seasons, do a full inspection with a helper and make a repair list, so jobs get done before the trailer is needed.
Key takeaways
- Inspect hitch, chains, tires, brakes, lights, floor and frame before each trip.
- Match the ball, coupler and tow vehicle ratings to the loaded weight.
- Replace aging tires and watch for rotting floors.
- Registration and animal-haul rules vary, so ask your state agencies.
Sources and further reading
Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.