We just spent 3 1/2 months in our motor home in North Dakota. We were living in it while our new house was being built. In November we had 3 weeks below zero and in December we had 2 weeks below zero. We didn't have any skirting. We have a 2003 Winnebago Adventurer 38G. One thing you will probably want is a larger propane tank. We had a 125 gallon tank and a MB Sturgis Extend-A-Stay on the motor home. Below zero we used 4 gallons of propane per day. We also had two 1500 watt electric heaters, one at each end of motor home.