Our preferred way to camp in freezing temperatures is with full hookups. Campsites with full hookups offer power, water, and sewer.
We have a heated water hose from Amazon that works well for our needs! The hose we bought is 25ft long. We also have a fully insulated and enclosed underbelly. Our floors are not immune to getting cold, so we sometimes run the propane heater to warm up the floors.
We usually keep the propane heater thermostat set pretty low because my husband and I like the cold. Besides the propane heater, we also have an electric fireplace. Just a few minutes with this thing on, and the whole camper is nice and toasty! Plus I really enjoy the flames. In the bedroom we have a small space heater that we turn on sometimes to take the chill out of the air when getting up in the morning.
He liked to lay on the mat in front of the sink but would get mad if we stepped around him while cooking, so a sacrificial towel was placed by the fireplace. Now he sits there during the day. We had our first dry camping experience in this rig earlier in the week!
The outside temperatures were in the 20s, so cold but not below zero. We were camping in a Walmart parking lot in Texas, so we had room to push the slides out and run the generator if needed. We kicked on the space heater for a few minutes to take the chill out of the air. Since our underbelly is fully enclosed, we determined it would be fine to leave the tank heaters off. And it was fine! No water issues. Had we been camping in sub-zero degree temperatures, we would have ran the tank heaters and used the generator to charge up the house batteries.
