Abstract: A trailng arm modular axle suspension unit including a hanger for attachment to a vehicle frame and having spaced sides and fore and aft and central portions, a trailing arm having sides and fore and aft and central portions, a rubber bushing mounting the fore portion of the trailing arm on the fore portion of the hanger, the aft portion of the trailing arm extending beyond the central portion of the hanger, a U-bolt construction for mounting an axle on the aft portion of the trailing arm which extends beyond the central portion of the hanger, a shock absorber mounted between the aft portion of the trailing arm and the aft portion of the hanger, and rubber springs secured between the opposite sides of the central portion of the trailing arm and the opposite sides of the central portion of the hanger.