A supplemental torsion suspension system for a vehicle having primary suspension system is provided along with a method of use thereof. The supplemental system has a rotateable torsion bar and a lever arm extending from the torsion bar for engagement with a control member of the primary suspension system. An actuator is coupled to the torsion bar and is operative to impart selective rotational movement to the torsion bar and the lever arm. A corresponding application of an applied adjustment force is imparted on the member of the primary suspension system through the lever arm of the supplemental suspension system to move and/or maintain the vehicle at a desired ride height.