We use our motorhome on snowmobile trips. We semi-dry camp it.
Winterize your fresh water system, anti-freeze in lines etc, and just use our holding tanks.....
We take drinking water jugs inside the coach with us to use for water. Put RV anti-freeze, 1/2 gallon or more in each holding tank depending on how cold it is expected to get, black tank (via toilet) and gray tank (via shower drain since you won't use it with below freezing temps). probably could get by with less or maybe no anti-freeze in tanks that have arctic pack heaters
Enjoy the snow