Here is what I used. At 6'2 I can only sleep in the back diagonally. I pull the pins and throw the bottom seat in my Yakima Roof box. I fold the back down. Slide the front seats forward and fill the footwell space with gear to bring it up level.
@NookShneer used a pretty slick removable pin system to quickly take out/install the rear bench. I think he made a thread on it.