Abstract: An interlocking slidable assembly useful for movable extensible platforms, such as a movable or sliding floor or plate extension used with the rear cargo areas of a motor vehicle such as a pickup truck. This assembly includes a first and second plurality of rotatable members spaced apart along parallel axes that slidably interlock with the guide members of the rail or rails. Each of the rotatable members is rotatable about a substantially vertical rotational axis and slidably engages the respective guide member of the rail or rails. One of the guide members or the rotatable members have a recess in the periphery thereof to slidably receive the other of the guide and rotatable members. Because the rotatable members rotate about vertical axes, there is better and more even distribution of weight on the weight-bearing surfaces that makes it easier for slidable movement and decreases the amount of wear.

Abstract: A truck bed or vehicle cargo liner with integrated sliding bed extension including a drop-in truck bed liner or cargo liner (16) formed of composite/plastic materials with one or more molded composite/plastic or metal rails (18) integrally formed or attached to the structure of the liner (on the floor and/or liner walls) and a bed/floor extension plate (20) of lightweight molded composite/plastic materials or metal plating (encased or not within a shell of composite materials) or a combination of the two in which the underside and/or sides has/have one or more composite tracks (22) integrally formed or attached to the structure of the extension plate for mounting said plate to the previously referenced rail/rails.