Welcome to the site.
I would do both: Winterize and find a heated garage.
Winterizing and dewinterizing takes all of 15-20 minutes. Time well spent ensuring the coach is ok.
We've taken winter trips from MI to the South. I usually dewinterize at the first overnight in warmer climates and winterize as soon as I get home. This means that the first leg of any trip we use public restrooms (which, given current circumstances, may dictate that you dewinterize before leaving on the trip--no matter just run the heat).
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