Rod E, here's a bad pic of the panel system I put in. There is 1/2" ply from the floor to about 3" above window ledge, 34" from floor, making a nice channel to set things in. They are attached via 1/4-20 rivnuts. I have upper sections to cover the windows as well. The 3/4" unistrut is attached to the plywood only, with through bolts. I have two levels of unistrut, the tops at 16" and 28". The panels were made out of some extra construction stuff, so they aren't too precious. Horizontal 2x4 and 1/2" ply for the rear two, and 3/4 hardwood ply with 2x ripped down 1/4" so the panels are the same thickness. The lower ledger (unistrut) allows a seat height for unexpected overflow. Or, with a panel on the top ledger and another on the lower ledger, a rear facing bench and table. With all three panels in place on the top, there is room for gear underneath and a bed on top; or vice versa. The panels are only 1/16" shorter than the width, and can be placed by holding them diagonally and then resting the other end down. I did have to chamfer the upper edge on one side so they could be loaded. I wanted them to be a tight fit so they would not rattle or slide. The rear panel is not as deep as the other two, I made it to fit over the space in the back when the bench seats are installed. All three panels combined make a 6'+ platform. In this pic, I have one of the platforms mounted on the side with 2 legs, with the rear panel making an L shape. Unistrut L-brackets and screws hold it to the wall. I've found this setup most useful because I can load panel goods (like that sheetrock) and still walk into the back when empty. The red boxes in the back are plastic Ikea shoe bins that fold open, they are nearly the same depth as the wheel wells, but needed to be shimmed out a little to fit with the angled rear door trim and still sit on the floor.