Martinjmpr
Wiffleball Batter
I love my 4th gen sleeping platform. I used 3/4" ply in a half hour glass shape to conform to the wheel wells- it sits a fraction of an inch above where the double-decker thing sat. I used 4 1x10 boards running front to back as vertical supports joined across the back by a 1x6. I did not taper for the sloped floor. There is no bottom. Rubbermade tubs slide freely in the 3 channels created by the vertical supports. This stays in the truck full time with recovery gear and a cooler stored underneath. For camping trips, the back seats fold down, and additional boards rest on a lip on the back of the storage platform and the folded down seat bottoms I made 2 boards- one wider than the other, so I can sleep 1 while still keeping half the seats up. The sleeping surface is not flat, but it's close enough for me. I'm 6'4" and mostly fit, even with my girlfriend and a 60 lb dog (front seat).
Sounds interesting - do you have any pictures, by chance?