Abstract: A ladder apparatus having an elongated ladder assembly, a pair of pivotally mounted supporting legs, braces positionable to interconnect the legs and the ladder assembly to retain the legs in stable supporting relation to the ladder assembly, a collapsible platform borne by the ladder assembly and an adjustable leveling device mounted on the ladder assembly for ground engagement to support the ladder assembly on uneven surfaces. An auxiliary support assembly adapted for attachment to a ladder assembly having the foregoing elements.