All your trailer tires should be the same type, size, and construction—do not mix bias-belted trailer tires and radial trailer tires. In selecting tires for your trailer, buy the size, type, and load range found on the trailer’s certification label or in the owner’s manual. Keep in mind that trailer tires have a load rating that indicates the amount of weight they can carry safely. As with your tow vehicle, always maintain proper tire pressure and replace worn tires. Remember—your tow vehicle tires may require a higher tire pressure for towing, especially heavy loads.