I have a 6 1/2 foot bed on an F150 with a Leer cap. I built a deck in the bed level with the top of the wheel wells. This gives me a flat floor and about 10 inches of storage under the deck. We put a futon mattress on the deck. I have a truck tent that fits over the cap door and tail gate that gives us an area about 2 feet wide at the end of the "bed". It sleeps great. If we are travelling (not staying more than over night) it is perfect. If we plan to stay longer we put up a tent and canopy. The truck bed feels a bit cramped after a night or two. You just need to stand up some times.