SPX Brand's OTC's premium, heavy duty service jacks - OTC 6-Ton (P/N 5206) and 10-Ton HD (P/N 5210) - are specifically engineered to lift loaded trailers, buses and other Class 7 and 8 vehicles. They incorporate a "dead-man's" lowering control system to prevent the load from lowering without continuous, active input from the technician, and to better control the load during descent for increased user safety. The jacks have an easy-to-use foot pedal for quick approach of the lifting saddle to the load, and a built-in storage tray. Modular construction simplifies assembly and allows for easy maintenance.