I have a 2022 Elite II. I ran three lines of heat tracing on the water lines including bathroom, outside shower lines, water intake lines, over the water pump, etc. I also added a heat duct to carry heat through the streetside basement. This gives me two lines of defense from freezing temperatures. Monitoring my bluetooth thermometers tell me that the furnace does a fantastic job of keeping the basement above freezing. The furnace actually runs more efficiently and quieter with the added duct. When plugged into shorepower I use a small AC space heater and open the little garage door and face the heater toward the garage. When driving I turn on the inverter to run the heat tracing which comes on at 40 degrees. I have three thermometers placed around the basement and they have confirmed when the heat tracing comes on. So far we have driven and camped through 20 degree weather. Yes, all of this required me to stand on my head and squeeze into small places but the peace of mind is well worth the struggles.
I have yet to test not winterizing for next winter, but think I might try it. Input?
