With doubleaxle trailers, it’s important to run with the trailer as level as possible in order to distribute weight evenly over all four tires. “The axles need to work together,” says Tom Scheve, co-author of The Complete Guide to Buying, Maintaining, and Servicing a Horse Trailer. “If you start to lift up or drop down on one end, you are going to overweight one axle, and especially the tires.” The added pressure will cause heat and increase the risk of a blowout.
To check, first top up the tires to the recommend psi, and park your loaded rig on flat, level pavement. Then, measure the distance from the frame of the trailer to the ground at both the front and rear. If the measurements are not nearly equal, then you may need to adjust the height of your hitch. Scheve also suggests standing back and looking over the tires. “Make sure they are both flat at the bottom,” he says. “If one is rounder and one is flatter, then they are not evenly weighted.”