I can understand the desire to go off road with something warm. Heck, my "RV" is a 9'10" Lance Truck Camper on a 4WD truck, not a trailer or a 5th Wheel.
The thing about these are they can go any place you can make them fit. At -10, I loose my hot water. At -20, I loose both. Prior to that point, the forced air and design of the ducting keep the pipes running and the holding tanks from freezing. When it gets that cold, it's time to go home anyway.
One thing I've learned if you are staying out there for very long, you need to stay warm, especailly after a tough day in the mountains. A good night's rest and some warm food, and I can go for weeks. even months. But if i'm marginaly warm, I don't sleep well and "burn out" in a week or so. E
