Quickly and easily change flat tires on any tandem-wheel trailer. Simply back the intact tire onto the trailer aid. It safely raises both tires to an ideal changing height without the hassle of assembling and cranking a jack. It’s great for changing tires on horse and livestock trailers without unloading. Great for leveling trailers and RVs. Made of a high-strength, lightweight polymer for easy lifting and transport. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Stabilization Accessories.