Make him a Queen size and he can fold it the way he wants to when he is decorating the bed. Then he has full comfort when he is sleeping under it. We have some (lots?) of truckers on the board. I am hoping they will chime in.
I would like to compliment you on your post 'title'. It is specific, detailed and to the point. It will get the attention of the 'big rig' specialists. Then there are those like me who have never been in a rig. But, I vote for Queen size so he can be all snuggly and warm as toast.