Here is the modification we made to the truck so the boys have a nice place while we are traveling:
With the seats up
Metal pulls out for storage
Four totes stored
The board cut to fit and covered with 3" foam then covered with a plastic table cloth type material and stapled underneath
With the board setting on top of the totes the space is complete.
We will put their pillows and cover loose with some material, that way I can wash it.
Even a little storage underneath