Myself along with some friends of ours survived our first winter camping. We dealt with a lot of snow and 15 below weather.
We have a fifth wheel and he has a motor coach. We purchased a heated water hose to hook up to the facilites water which they had wrapped in heat wires. The heated water hose had a sensor to turn itself on and off to keep the water line from freezing.
In my storage compartment I purchased a plug in adapter with a temperature gauage. I plugged a heater in this and set the temperature at 65 degrees. I also placed a wireless temperature gauge in there to monitor the temperature inside the unit. I placed another wireless temperature gauge in the water hookup area to montitor as well.
We had a skirt made to attach to the fith wheel which reduced cold air blowing under the unit. Being on cement we used water filled tubes to hold it in place. Next year I will be using sand bags. They will handle the harsh winds better. Heavier to deal with but worth the trouble.
The holding tanks were dumped once a week. We did not leave the dumping hose hooked up. I would also recommend the shortest hose to dump because it will be easier to deal with in the cold. Just one less place for freezing problems. We also did not use our on board washer and dryer. More opportunity for potential freezing.
We borrowed a 100lb propane tanke to hook up outside. It was easy to monitor the level of fuel and get it filled. If we ran out for any reason we always had our onboard tanks for backup.
Next year we will add some insulation in the cabinets on the outside walls. You could feel cold air when you got into the cabinets. They talk about the great insulation but it just did not seem enough in the cabinets.
Our friends with the motor coach did pretty much the same thing except for a skirt around the coach.
With a little research and attention to detail winter RV'ing is great.