SuperDave, I have a topper on my truck now that I would like to keep on there to keep gear dry, etc. I am looking for a camper to have a place to sprawl out and sleep, move around a bit more.
Trail-explorer- Thanks for the link, looks like some good information.
Reddog1 - I am not too worried about camping year round as I will not have and plumbing, refrigerators, etc. I camped out of my truck topper two nights at -2 deg. (then proceeded to load a boat and boat to a place to start my elk hunt) It was cold, but with the proper equipment I was able to keep the bed at around 40deg. I think with some cheap insulation I could manage to keep a TC fairly warm. Nor do I intend to be back in that degree of cold again. This was last winter while I was living in Montana.