Level your trailer from side to side in minutes! Park your trailer, put the Rv tire leveler around the trailerâ€™s low side tire and ratchet screw until the trailer is level. Works with single tire locking chock to provide side to side stability while leveling. Ergonomic ratchet provided for raising and lowering. Fits most trailers with 13", 14" or 15" tires. Corrosion resistant finish for long life. 1 per box.