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I have a passenger van with 2 of the 3 rear seats removed. I made hooks to catch the seat mounting brackets, then installed heavy duty drawers that ride on skate board roller bearings.
In the front end of the drawer housing I mounted a 30 gal water tank. Plumbed and Wired that to a 12V RV pump.
On top of this is fitted foam that creates a good size bed. Love this for camping. More pictures and details of construction if you are interested. Just follow the link.