Activities The Great Outdoors Checklist for Boat Trailer Maintenance Simple Do-It-Yourself Advice for Trailer-Sailors Share PINTEREST Email Print The Great Outdoors Sailing Navigation & Seamanship Gear Types of Sailboats Hiking Climbing Skiing Snowboarding Surfing Paddling Fishing Scuba Diving & Snorkeling Learn More By Tom Lochhaas Tom Lochhaas is an experienced sailor who has developed several boating safety books with the American Red Cross and the U.S. Coast Guard Auxiliary. our editorial process Tom Lochhaas Updated July 06, 2017 Too many trailerable boat owners ignore their trailers, leading to breakdowns on the road and potentially dangerous situations. Routine inspections and maintenance keep your trailer safe and working and can extend its life for many years. Inspection and Action Steps Before Use Grease the wheel bearings before use (see below)Check that tires are properly inflated (usually around 50 lbs pressure, not 30-35 like most auto tires) and wheel lug nuts are tight; check tire tread for wear and sidewalls for spider cracks that may indicate dry rotInspect the whole trailer for cracks or severely rusted areas that may have become weak, including the springs and axlesCheck rollers and runners for cracks or breaks; ensure rollers are clean and have not locked upCheck the winch's operation and the condition of the strap or cableCheck that the trailer ball is tightly mounted and the right size for the hitch; clean any debris from both before seating the hitch on the ballEnsure that the hitch coupler is locked in place and secured with a bolt or lockCross the trailer safety chains before securing them to the tow vehicle (the crossed chains "cradle" the trailer hitch if it comes free from the ball)Ensure the trailer tongue jack is completely rotated up and locked in placeEnsure the trailer lights are working, including brake lights and turn signalsIf the trailer has brakes, test that they are workingAvoid overloading the trailer by removing heavy items from the boat and transporting them inside the tow vehicle (many boaters remove outboards)After haul-out, remove any drain plugs to drain bilge or hull water Routine Maintenance Check the trailer for nongalvanized parts (U-bolts, nuts, wheel lug nuts, add-ons) and spray them with a rust inhibitor like Corrosion XAfter immersion in salt water, rinse the trailer with fresh water; if practical, dunk the trailer in a fresh water lake on the way home (also run the motor to flush it with fresh water)If the trailer is painted rather than galvanized, check carefully for rust; remove rust and repaint as needed; use auto wax to help protect the paintIn hot, sunny areas, spray the outside of the tires with a product like Armor-All to prevent dry rot caused by heat The Wheel Bearings Because the wheel bearings are the most vulnerable part of a boat trailer, take the time to keep them well greased and protected from the elements. If the trailer does not already have them, install "bearing buddies" on each hub; these help protect the bearings from water and have a grease nipple for quick application of bearing greaseInstall dust covers over the bearing buddiesAdd bearing grease before starting out - but not so much that the rear seals are pushed out; be sure to use marine grease, especially in salt water If the trailer has not been used recently, stop after a short distance of towing to check the hubs for heat, which indicates a bearing problem. If the bearings heat up even when greased, repacking is probably necessary. You can do this yourself if you are competent mechanic; otherwise go to a professional. Spare Parts to Carry Fully inflated spare tire of the right sizeGrease gun and extra greaseRoad flares and flashlight if towing at nightSpare fuses and light bulbs for lightsLong-distance towers may choose to carry a spare wheel hub Tips for Safe Trailer Use Always use a good tie-down to secure the boat to the trailerAt stops when towing, visually check the trailer and boat, check the winch strap and tie-downs are still tight, and feel the wheel hubs for heat that indicates a bearing problemAfter arriving at the water, allow bearings to cool before immersing the wheels in the water (sudden contraction with cold can suck water into the bearings)Before launching the boat, unplug the trailer lights Related articles of interest: Boat Maintenance & RepairSafety Checklist Before Going SailingHow to Buy a SailboatBest Websites for Boats for Sale