rug buddy for heating our (cold) floors

Don I admire you for attempting to camp in this cold of weather, the only thing that I could add to this thread is my attempt at staying warm in the winter on my motor cycle. When I was traveling from home to a technical college in 20-30 degree F weather I would use a 1/4 neoprene wet suit under my dungaree jacket and pants. It worked well except for my head which was exposed. The newer ones are lined inside and out and are much more flexible some are made for hot water to circulate. Based on what I know I think I would use your existing efforts to keep the MH above freezing and wear a an 1/8 -3/16 in thick suit inside to keep your body warm.