Roll A Cot
After reading the review in the first gear issue of OJ, I picked up one of these:
http://www.camptime.net/roll-a-cot.htm . Pricey, but one of the best night's sleep away from home I ever had! Easy setup, able to adjust sleep surface tension, and durable. One downfall for some, not me though, is storage space. It's about three feet long tucked in the bag, and roughly 6-8" in diameter. I find that an advantage, because most cots store flat and are bulky in a cramped overlanding vehicle.