to right standoff bracket 30 which is also bolted to frame rail 34 articulated support member 32 also shown in fig4 extends between structural member 36 and tie bracket 40 which spans left standoff bracket 26 and right standoff bracket 30 member 32 is articulated to facilitate installation of the present step assembly upon a vehicle fig1 shows step assembly 10 in its stowed position with step beam 38 in a tucked and upwardly angled position step beam 38 is attached to left step stringer 62 and right step stringer 66 stringer 66 is shown with particularity in fig2 and 3 in fig2 stringer 66 is in a generally horizontal stowed position in which stringer 66 abuts a lower portion of right step bracket 18 not shown due to the cutaway of fig2 as seen in fig2 and 3 right step stringer 66 is pivotably attached to a free end 46 b of hinged pedestal 46 pivot 58 maintains step stringer 66 in rotatable contact with right hinged pedestal 46 right attitude link 54 which has a first end 54 a mounted to right step bracket 18 and a second end 54 b pivotably mounted to right step stringer 66 controls the relative rotation of step stringer 66 such that the generally planar tread surface 38 a which is part of step beam 38 is maintained in the illustrated horizontal orientation of fig3 when hinged pedestal 46 is in the generally vertical deployed position of fig3 conversely when hinged pedestal 46 is in its.