We just got back from North Dakota. The day we left North Dakota it was -13F. Ouch. Why? Our truck broke down on Thanksgiving day (+40F) and was just fixed 2 weeks later. We left the next day. Our Cedar Creek has heat pads on tanks which we used with no problems with temperatures dropping to the low teens overnight and ranging from +20 to 40F during the day. No water problems. We drained our tanks and winterized when the temperature dropped below 10F. The freshwater tank drain was exposed and frozen and had to be thawed out with heat tape and insulation.
The temperatures inside were comfortable even when the outside temperatures dropped to -13F (-29F with wind chill). We used our propane heater set at 65F (it ran about once per hour) and our electric fireplace and space heater and ceiling fan. The propane furnace heated the underbelly via the exposed heat duct. We used a lot of propane (three 40 lb tanks in 2 cold weeks).
Our big problem was our hydraulics. They worked long enough to get the slides in and the truck hooked up. I still had leveling jacks down and the motor/pump just clicked when activated. Lippert Level Up warns of problems with hydraulics under cold conditions and give a manual procedure to perform the task. It was a very cold 2 hour ordeal. We left immediately heading south. Our hydraulics still just clicked when we hit our first stop (+22F). When we got home, a couple days later, we found out that our Lippert Level Up system has two very well hidden mini circuit breakers mixed in with the wiring, one of which was tripped.
Another lesson learned was concerning snow. We left the slides out during a blizzard and 8-12 inches of snow had to be removed from the protective slide covers before we left. The next time snow comes we will close up the slides until its finished.
We had a great time. And we're glad we're home. We love our 36CKTS.