I pulled out my 2nd row of seats, so I could place a long matress on the floor of my 1995 FJZ80. The former foot area creates an empty channel which is about 5" deep, 10" wide, and 44"-58" long. I would like to fill this in with something to support the matress and allow for some storage. All that I could come up with so far is using 4 plastic shoe boxes. Anyone know of any storage boxes that fit this space?