A suspension includes first and second arms that connect a rigid axle to a frame structure. The first arm has one end configured for connection to a rigid axle structure and an opposite end adapted for connection to one lateral side of the frame structure. The second arm has one end configured for connection to the rigid axle structure and an opposite end adapted for connection to an opposite lateral side of the frame structure. The suspension includes a first air spring associated with the first arm and a second air spring associated with the second arm. The first and second air springs are configured to be positioned laterally outboard of the frame structure.