We were in Stillwater from 2 January to the latter part of May, so we have some idea of what you will be looking at. A heated water hose will help, but only for getting water IN. I don't know of any heated sewer hoses. Don't forget that you will need to either have a freeze-proof faucet or disconnect the hose when the temperature is predicted to get near freezing.
Another idea is to dump and fill according to the weather. If you know about how long you can go on the internal tanks, you can plan your filling and dumping accordingly. Obviously, you don't want to run out of water, nor do you want your waste tanks to overflow, but if you can adjust "utility" days a bit, you can do quite well.
David Lininger, kb0zke
Heartland mpg 181 (sold)
1993 Foretravel U300 (for sale)