I used 1x2s to create a platform which supports a shelf (covered with laminate flooring) and creates a "shield" for the subwoofer so my rolling light stand doesn't crash into it. I added carabiners to the right where I can attach bags and such. The red/black bag on the left attaches to the little tie down things on the left of the FJ and holds ratcheting tie downs, tools, and a cooler. The tubs underneath (bought at Sam's 2 for $12!) create drawers for my camera bag and other gear.