BendPak RJ-45-BYB Rolling Bridge JackWe designed and engineered the BendPak RJ45BYB airhydraulic rolling bridge jack exclusively for Backyard Buddy fourpost lifts. This compact 4,500 pound jack equipped with modified rollers and frame assemblies retracts to a low 3. 5 height from the top of the runway surface to accommodate low riding vehicles. The RJ45BYB rolling bridge jack rolls along the entire length of the Backyard Buddy lift so you can safely raise any part of the vehicle. Durable