Hi, I used to live in Arizona (husband was stationed there at the Marine Corps Air Station in Yuma), not sure if you had planned on going through that part of AZ, but you may want to try Desert Paradise RV Resort there in Yuma.
Yuma is really a nice town/city. We knew several wonderful "snowbirds" there... and we still keep in touch with a couple from Minnesota, even after 15 years since we've seen them! I miss it there so much! Got room for me?
Hope you have a great winter out that way! And a safe trip!