Abstract: A suspension system for liftable steerable axles has at least one steering knuckle; at least one pistonless bellows air spring actuator (ie., damper air spring); and a steering axle structure that has, at each end, a kingpin housing boss, a kingpin fixed into the kingpin boss, and a pair of steering knuckles that rotate around the kingpin and are supported by the kingpin housing; wherein the steering knuckles are connected at the bottom of each other side to side by a tie rod assembly that respond to each others rotational inputs. The lift axle suspension system further has x-rod control arms (or that is, the respective upper and lower control arms of each side are relatively X-configured or X-disposed relative each other) for improved lateral stability.

Abstract: A slipper and/or eyed leaf-spring vehicle suspension system is provided with a compliant oversized pivot bushing and a torque rod or control arm, respectively. Each of the torque rod or control arm are provided with at least one over-sized eye bushing-housing into which the compliant oversized pivot bushing is compressed into. The compliant oversized pivot bushing has an elastomeric annulus mounted on a rigid sleeve wherein compliant oversized pivot bushing has an overall outside diameter that is greater to much greater than its width.