US Patent 7857325 Adjustable-height suspension system

A system for adjusting the height or spacing between the frame and axle of a vehicle. The system may operate by manipulating a suspension system connecting the frame to the axle and comprising shock assemblies. The system may include hydraulic spacers selectively changing in length in unison, thereby manipulating the equilibrium positions of the shock assemblies and changing the distance between the frame and axle. Between changes in length, the hydraulic spacers may act as a substantially rigid bodies.