Launch the boat or remove the boat from the trailer. This allows you to inspect all parts of the trailer.
Wash and dry the trailer to remove dirt and grease.
Use wheel chocks to prevent the trailer from rolling during the inspection.
Hook up the trailer lights to your vehicle and check all running lights and brake/turn signal lights. Replace broken bulbs and add dielectric grease to all connections to prevent corrosion.
Jack up one side of the trailer and remove the bearing dirt cap. Repack or lubricate the bearings with grease specified for marine bearings.
Remove the tire and wheel hub. Inspect the brake assembly and replace worn brake pads. Replace the inner bearing seal if damaged or worn before installing the wheel hub. Spin the wheel and adjust the brake pads so they begin to contact the brake drum. Inspect the trailer springs or suspension and replace damaged parts before re-installing the tire.
Check tire condition and replace tires if tread is worn or tires are cut. Inspect valve stems and replace damaged or leaking valves. Check tire pressures and adjust to tire or trailer manufacturer recommendations. Use a lug wrench to tighten the wheel lugs.
Lower the trailer, chock the wheel on the side you have just inspected, and jack up the other side. Repeat the tire, brake and bearing inspection steps above for the other side.
Inspect the trailer hitch assembly, safety chains, wiring and surge brake assembly if present. Replace safety chains or cables if corrosion is visible. Lubricate the trailer hitch with a light coating of grease.
Look for corrosion or rust on the trailer frame. Remove it with a wire brush and apply primer and paint. Use galvanizing paint if the trailer is galvanized. Inspect the boat rollers or bunks and replace any damaged parts.
