RVing year round

We own a motor home setup for winter camping. It is equipped with waste tank heaters, has good insulated walls, has thermal pane windows, a well sealed entry door, and like many others it has M+S tires (M=mud, s=snow). With that said, we have never winter camped. I would think it critical to be hooked up to 110v to provide continuous 12V power for the tank heaters for I assume our 2 batteries would not be up to the challenge for an extended period of time. I would also plan to supplement the cabin furnace with an electric heater placed by the front cab area where most of the cold air will be leaking inside. We have camped at high altitude in freezing temperatures in the summertime. Though the furnace is very effective, when it turns off we feel that cool air re-entering from up front. If winter camping, I would drape a thick quilted blanket over the backs of the two front seats to seal off the front from the house. Though that covers only to the tops of the seats, at that height the air coming over the top should be much less cold, more mixed with the high warm air elsewhere in the house.