A step assembly includes a mount which is well suited for mounting on the rear bumper of a truck or a highway transport trailer. A linkage supports a step frame including at least one step member thereon for movement relative to the mount between stored and working positions. The linkage generally includes two parallel links in a four bar linkage configuration which extend upwardly and forwardly from the mount in the stored position and which extend upwardly and rearwardly from the mount in the working position such that the linkage must be rotated over a top centre position between the stored and working positions.
