Abstract: A liftable tandem axle suspension for a trailer including a central trunion frame mounted on the trailer frame, a front non-liftable axle assembly pivotally mounted on the central trunion frame and extending forwardly thereof, and a rear liftable axle assembly pivotally mounted on the central trunion frame and extending rearwardly thereof so that the rear axle assembly can be lifted when the trailer is not loaded.

Abstract: A liftable auxiliary axle assembly for a wheeled vehicle including an auxiliary support frame assembly connected to the vehicle frame; a pair of spaced apart torque arms pivoted on the auxiliary frame assembly about a common pivot axis so that the rear end of each is pivotally movable in a generally vertical plane; a pair of axle seat assemblies mounted on the rear ends of the torque arms for pivoting movement therewith and mounting a wheel and axle assembly therebetween; and a pair of chain lift mechanisms for selectively lifting the wheel and axle assembly from the road.