Not meaning to rain on your parade but since you brought up temperature...whatcha gonna do when it's really HOT outside (too hot even with the windows down) or when the temp drops? Or maybe you are planning on doing this only when we have mild temps?
I've done some road trips where I've slept in the back of the pickup...my only complaint, dew.
Michelle
PS. Um....what about the bathroom? Pee bucket in the van? *cringe*