Capacity, Guardian 78" W Hydraulic Edge of Dock Levelers for Conventional Trailer - 20,000 lb. Capacity, such as 6T, 8T, 10T, 12T, etc. Our shipping dock leveler is capable of servicing trucks 5 inches above or below dock levels and is available in both 20,000 and 30,000 lb. These ramps are fixed to the dock but can be moved from facility to facility if needed. The company's main: self-propelled lift, crawler lift, shear lift, hydraulic loading and unloading platform, lifting stage, fixed boarding bridge, mobile boarding bridge, aluminum alloy lift, rail elevator, hydraulic lifting platform and other series of products.