Meh always good to have for those oh shit moments.
I keep a full tool box, emergency rations and water, 10 feet of rope, first aid kits, and basically anything else I could need in my trunk.
At one point or another I've used most of it.
gotta be super specific over here
Had a Altima CAR that was large enough to sleep in the back seat.
Had a Infinity that had the front seats recline almost completely horizontal
Had a Acura that could do both but the back seat was more comfortable
they also have these http://www.ebay.com/itm/like/182286381829?lpid=82&chn=ps&ul_noapp=true