QueenD, keep in mind that Tempe is not like most other cities. It's just part of the huge East Valley area of Phoenix. Tempe, Mesa, Gilbert, Chandler, Apache Junction, etc all just run together -- there's no real border between them. Tempe being the closest to Phoenix itself is likely more expensive, and is less "open" than the others.
Check RVparkreviews.com for all the East Valley cities.