Is your fresh water tank inside the coach? (Many times Thor puts them under a bed.)
e.g. if its in the cabin with you then its heated. Typically all the fresh water plumbing is in the heated portion of the coach.
When we took a winter trip with our Axis to FL in December. I simply waited until our first overnight in warmer weather to dewinterize and put water in the tank (overnighted at a full hookup KOA so dewinterizing and filling was easy).
For the trip home I simply waited until we got home and winterized right away after unloading the coach.
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