Abstract: A method for protecting the suspension and frame of a vehicle is provided. The method may include providing a first working mode where the strut is at a fully expanded state, providing a second working mode where the strut is at a partially collapsed state, and providing a fail-safe working mode where the strut is at a fully collapsed state. The method may further comprise alerting the user that the strut is operating in the fail-safe working mode and servicing the strut by placing a fail-safe member into the strut.

Abstract: A suspension assembly having a frame hanger, a first control arm mounted between the frame hanger and an axle attachment member, a second control arm mounted to the frame hanger and to the axle attachment member, wherein the second arm extends from a centerline of the first control arm at an angle alpha such that the first control arm and the second control arm are not parallel to each other, wherein the centerline of the first control arm and the centerline of the second control arm extend to intersect at a point that is at a virtual center of rotation.