RMH in camper?

Can a RMH be used in a confined space? I am thinking about doing something like this for camping and am trying to figure out how to heat it without electricity. The one I would make would be longer than this one, and I can get by with a twin bed, so there might be room for a small RMH. The design has an open space under the floor, and I thought maybe I could vent it through there and have radiant heat coming up through the floor.