Camping in sub freezing weather

I was stuck near denver in November years back with temps dropping to 7 at night. The furnace ran all the time and burned almost 30 pounds a day. I also ran an electric cube heater and another electric heater at night under the rig. I had boxed in the tank area under the rig with celotex panels from hd. I also had the silver bubble wrap on all the windows and a blanket over the door. Luckily when i headed south the roads were clear. There is no way in the world I’d pull an rv on ice or snow covered roads. I don’t know what each state uses for deicing their roads but I can’t imagine any of it thats good for the underside of an RV.

This is a run of the mill poorly insulated RV so higher quality could help