They do make these that you can buy,any truck accesory place should be able to order one if not in stock.Rather pricey $500-$600 I think :eek: ,you can move it from truck to truck if your next one has the same size bed.OR Lay 3-2x6s one along each side and one down the middle.Cut 3/4 ply to fit on top and screw down.Build boxes to fit cavaties with 1/2 ply(lighter)use 2x2s or metal brackets to secure corners and bottom and just slide in(wax bed first) or lag bolt ply discs(wheels) to 4 corners to aid slideing in and out.Make some kind of stop so you don't pull drawers out and drop them.Hope this helps.SGB