A space saving system to provide stable and supported movement of an expandable room or other moveable structure relative to a vehicle or other base structure is disclosed. The space saving system provides an inner and outer nested tubular member within a floor of the base structure. Low friction bearings are used to separate and support the nested tubular members relative to one another. The inner member is fixed to the base structure and the outer member is allowed to move telescopically relative to the inner member. The outer member is vertically supported by the base structure through use of a low friction bearing. The expandable room is supported upon the outer member.