Abstract: A vehicle suspension assembly comprises a transverse box beam for a vehicle chassis, a central mount on an underside of the box beam, a combination composite spring and transverse control arm member having a dihedral for establishing a pre-load of the suspension system for establishing the vehicle ride height mounted at the center thereof to the central mount for supporting wheel assemblies at the outer ends thereof.

Abstract: A suspension system for supporting the body of a heavy-duty vehicle on an axle and wheel assembly comprises a first suspension hanger for attachment to a longitudinally extending vehicle frame, a second suspension hanger for attachment to the vehicle frame at a position spaced longitudinally from the first hanger, an elongated composite beam spring member secured to the first or second hanger and extending toward the other of the hangers, and an axle attachment bracket operatively connected to the composite beam spring between the first and second hangers for supporting an axle.

Abstract: A vehicle suspension system which includes a passive spring system including composite control arms for normal support of the vehicle for normal load, road and handling conditions and an active system responseive to deviations from normal conditions for support of the vehicle for abnormal load, road and handling conditions.