Full timing in cold weather

I have a bighorn silverado and we full timed at our house while we remodeled. The only real problem that I ever had was the water lines going to the kitchen sink and back bath freezing due to them being seperated from the exterior by maybe 1/8" of insulation sheeting on topp if the underbelly. I did have a heat lamp in the underbelly which kept it from freezing until the single digit level, where I needed to run a salomander heater for ten minutes blowing under the camper. I also had skirting around the back holding tanks with another heat light but rarely had any problem there.

Interior was not bad, but went through a bunch of propane.