Abstract: A moveable storage system having one or more storage units, a plurality of flexible track elements conformable with an irregular supporting surface, and an individual base structure which supports each storage unit for movement along the track elements through roller members associated with particular track elements. One or more of the roller members is a load leveling articulated wheel assembly having a pair of spaced roller wheels operative to pivot about an articulation shaft to conform with flexible track profiles to accommodate supporting surface irregularities under and between various track elements spaced along the length of the storage unit.