Clark
We have wintered almost 10 days with 3 of the nights being 6 degrees with wind, last December down in Oklahoma with our family for the holidays, we had no problems. Ours has the Back To Montana package and I dropped the enclosure and added 3 1/2 inches of fiberglass insulation in the entire bottom. On the big rear window, we covered with window covering,with heat shrink film. We also put styrofoam on the bedroom window near our heads between the windows and screen. The crank up vents, we used those vent pillows which are insulated which can be purchased at any RV service store. We also received a gift of a Down bedspread, and kept very warm. (In fact, thought we were home with the electric blanket)! You just don't want to turn your thermostat too low and use the electric heat, as it's not heating your basement as well where your tanks and water lines are.When we arrived back in NE. it was very cold and we did have the low point drains freeze but just used a cordless drill to drill up through the pipe to drain, being very careful. I now replaced the drains with frost free sill-cock drains which works great now even to wash the bugs off the front of the camper in the summer between campsites. Hope this will help you in some way.
Larry & LaVonne