Abstract: A modular, low cost pallet and shelf assembly with one or more removable caster assemblies is disclosed. The caster assemblies each comprise a first member, the first member having one or more first member features disposed to be removably coupled to a corresponding one or more first matching features of a vertical support member of a shelf assembly; a second member, the second member having one or more second member features disposed to be removably coupled to a corresponding one or more second matching features of the vertical support member; and a wheel assembly, coupleable to the first member and the second member. In one embodiment, the caster assembly includes a horizontal member disposed distal from the wheel that interfaces with a securing member to bear at least a portion of the weight of the rack assembly and to stabilize the caster when mounted to the rack assembly.