Abstract: An apparatus is described capable of use on smooth and rough terrains at both low and high speeds. The trailer apparatus has an auto leveling feature combined with uniform loading support that reduces torsional loading of the cargo. The invention also includes a trailer capable of travel at high speeds, which hydraulically equalizes distribution of the weight of the cargo. The invention further includes an easy lift tow bar, all axle steering, single tire axles, self-leveling and adjustable suspension, combination of air, anti-lock and electronic braking system, and ability to travel at high speed speeds with reduced system sway.

Abstract: An apparatus and method is described for offsetting a lifting or lowering weight of a tow bar attached to a trailer. The apparatus includes nitrogen accumulators coupled in series to a hydraulic cylinder. The accumulators include volumes of hydraulic fluid and a gas, such as nitrogen, which are preset to have differing nitrogen pressures to accommodate a full range of motion. After initial system pressurization, no separate power source is needed to provide hydraulic support at static conditions, oscillation of the tow bar below horizontal, and lift support from horizontal to a positive angle, allowing the user to lift and position a heavy tow bar several feet with minor user force.