Got tired of having the items I want in the back of the cargo area and having to pull everything out. Built a rolling cargo tray. I have about $200 in materials utilizing "select" grade wood rather than the junk construction grade. 1 1/2" rigid rollers are mounted upside down on the floor. Outside frame is 1x6. Inside of frame is 1x3 on top and 2x2 on the bottom leaving about 1" channel for the slide. Tray is 3/4" plywood with 1x3 sides. Cross member in frame for added strength is 2x2. The pictures are not in order, but should be able to follow.