Ted Sensenbrenner: Hi! I am Ted Sensenbrenner with Boat Owners Association of The United States. What if on the way to the lake, with boat in tow, your trailer gets a flat tire, its a fairly simply job to change but a little different from changing a car tire? Let me show you the safe and right way to do it. If you notice a flat, pull as far off the roadway as possible and onto a level surface. Use your emergency flashers and engage the parking brake. If you have them, set up safety triangles or flares. Get your jack and look to see if you have the necessary clearance to insert it, with enough room for the new fully inflated spare tire to clear the ground. You may have to improvise with a block of wood, either under the jack or under the tire to achieve the right height. Insert the jack under the frame or axle as close as possible to the flat tire. Its important that you select a solid location. Before you start jacking up the trailer, loosen the lug nuts while the wheel is still on the ground. This prevents the wheel from turning. Once loosened, start jacking until you have clearance for the new fully inflated spare, remove the nuts and replace the tire with the new spare. If you need to, its okay to jack up a little more to get the tire to fit. Then, tighten the lug nuts by hand and snug them with a lug wrench. Give the tire a spin to be sure nothing is hung up. Its important that you dont use lubricant or Anti-Seize on your lug bolts. Now, release the jack to make final tightening easy. Tighten in an alternating pattern and re-tighten them after driving a bit. We at BoatUS also want you to know the leading cause of trailer tire failure is under inflation, so be sure to check your tire pressure often. You are ready to hit the road!