Thanks for the replies. Good info. No, I wasn't planning on staying overnight; just looking at it as a charging option. Sounds like a 14-50 adapter would get much use unless you are a camper.
What is a "typical" campground charge to use a 14-50 outlet. Do you have to rent a space overnight just like an RV?
Seems like it could be a fairly expense charging option, but, of course, it might be the only option.