Well I am 5'11 and I did not have any problem lying down in the back and closing it up, might have to break out the iso mat, hell I still have some of My dads rubber Biotches from when he was in. They still hold air Top! Got a few patches but non the less they work. Near the hatch there is a about a foot of play so if you lie in there with your head toward the cab I can get in it comfortably.