Abstract: 32 A slidable room assembly comprises a vehicle body having an opening formed in an exterior wall, and a reciprocable slideout unit or compartment disposed in the opening and slidable between a retracted position and an extended position. Sliding movement of the slideout unit is controlled by means of a drive mechanism which includes either one or two endless cables. A plurality of sheaves, rotatably mounted on the slideout unit, define a path for the endless cable or cables. This path includes a pair of parallel longitudinally extending courses disposed on opposite sides of the slideout unit. Anchors, attached to respective longitudinally extending courses of the cable(s) and to adjacent portions of the vehicle body, effect relative reciprocation between the slideout unit and the vehicle body. Sliding movement of the slideout unit may be either motor driven or manually powered.