Thank you for your service. We travel a lot in the Winter and have camped at the National Parks in sub zero weather and like to visit our Granddaughter and her Navy husband stationed in Denver during the colder months.
We use very little propane for heat and rely on electric heaters and our portable heat pump unit to keep the coach warm. We also use an electric blanket at night.
We always keep the fresh water tank topped off and use it for our water supply. We only hook up a hose to fill the tank.
We connect to sewer only when we need to dump our waste tanks.
We have a thermostatically controlled incandescent 150 watt light bulb in the wet compartment to keep the water lines and pump from freezing.
Keep in mind that even tho we are both from Florida, we are comfortable in our coach with an interior temp of 65 degrees and an overnight temp of 60. We have a large Great Pyrenees dog that also enjoys the cooler tamps. I also always carry tire chains so that we can get in to and out of RV parks that are not completely plowed.
Winters can be a challenge in an RV but they are doable with a little common sense.