I had a 99 Montana 295RL and worked in Bloomington IL for 2 1/2 years. It got very cold there but I had very few problems. Every winter I put a plywood skirt around it and used styrofoam insulation board, tape and spray foam to seal it up, had the gas company put in a Pig and ran the heat off of that (instead of the 30 gal tanks) and they kept it filled for me. I flew home to Atlanta every weekend and left the heat on 55 when not there. I also used ceramic heaters when I was there but still ran the central heat - at 30 below you needed all of 'em. The wind was the only problem, if the air can get under the unit to the water lines, they will freeze so I dropped the underbelly and put insulation around the water lines. In most cases I was able to put the cold and hot line in the same insulation cover up to the separation - just want to keep the wind from getting to them. Granted it was a challenge but I enjoyed it. Plus the CG was not too crowded in the winter.
2014 FR Crusader 315RST
2014 Ford XCabSD F250 6.7L