Hi Mark,
No campgrounds are open or I'd be going to one in the cold months. I do have a good relationship with the local RV dealership whom I store with between trips, so in an emergency I could, in theory, thaw out in their shop if need be.
I also have friends that I could impose upon for a 15 amp circuit. But I'd be using that as a "last resort".
In some cases, I'll be able to plug in over night--I have a few Church clients who are glad of a small discount ($10) for allowing me to use their power and sometimes their washrooms.