The dolly is constructed with wheels to provide mobility and with posts to allow for stacking of one dolly on another for storage purposes and return shipment purposes. A long dolly may also be provided with laterally mounted posts for receiving and supporting a shorter, but wider, dolly thereon. Each corner post is provided with a dependent pin that is able to fit into an opening in the upper end of a post of a dolly below. Removable support feet are provided for supporting a loaded dolly for transport with the wheels in an elevated position.