That picture was taken inside his Adrenaline Camper. The Adrenaline campers and the Kimberly Kampers have ample room (As illustrated in the image) to set up cribs, a table with chairs, or even bunk cots in the entry way. This is part of what makes them so appealing to families. The entry way is the unfolded roof.
Is it the setup/pic that makes you think it's a hoax, or the fact that he wants to use a catalytic heater in the space with the family?
I'm sure you know, but the name was "Seldom Seen Smith." Might as well sign on George Mayduke, Bonnie Zigzag or Doc Tarvis...