hmmm.
Hmmm,, it is an interesting idea. If something like this had been on the market 3 years ago, depending on price, I might have gone that route instead of building my own. KISS I say, my sliders are candle wax on wood and the drawers pull all the way out and rest upon the tailgate with ease. If I had it to do over again I would of used a better plywood than the marine grade plywood that I utilized. I may yet install another set of tie downs in the middle of the deck, and I may yet install industrial carpeting up top. One of the guys in our club (TLCA) attempted to build and market his own design a few years ago to no avail. The shipping costs combined with lack of market demand killed the idea. I think he may have sold 4 or 5 units. Your idea is unique in the drawer market and may succeed. I recently purchased a Frontrunner full sized roof rack. Some are put off by the assembly process, but I rather enjoyed it, and I got the rack for the same price as the low grade steel racks. If you can keep your prices down, build a quality "kit", use the KISS principal and offer free shipping, it may take off. Not to highjack this but here is an image of my well constructed, poorly made (I'm no master carpenter by any stretch) drawers. I spent about $200 on wood, and hardware.