Quickly and easily change flat tires on any tandem-wheel trailer with the Camco RV Trailer Aid. 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. Also great for leveling trailers and RVs. Made of a high-strength, lightweight polymer for easy lifting and transport.Manufacturer model #: 21. High-strength, lightweight polymer construction Change flats on any tandem-wheel trailer without having to assemble and crank a jack Great for horse and livestock trailers Equally useful for leveling trailers and RVs