Hey there!
Thanks for the quick replies. Right now, it's showing a low temperature of 31 degrees on only one of the days I'm traveling. So almost entirely above freezing, so long as the forecast is accurate. (I tend to trust current weather reports more than two or three-week forecasts!)
I do have the enclosed underbelly, which complicates things significantly. I can't get to the water heater, etc., without peeling that liner open. And, frankly, I have two months total experience with RVs in my life. I don't have my "real" tools, a garage, etc, to do this with because I'm on the road.
I was kind of hoping someone knew of a slow heat product, or whatever. You know, magic of some sort!
I think I'll end up looking for indoor storage, or a campsite where we have hookups to run space heaters while gone.
What does it typically cost do have a storage facility winterize and de-winterize? That would let me store it outdoors (cheaper than indoor storage!) without the danger of a space heater running unattended!
Thanks again for the good answers!