Many options, prices depending on location, nature of facility (ranges from RV parking lot through mobile home park to full fledged seniors resort) and size (actual park model RV under 400 sq ft to 80 sq ft plus manufactered housing). Maybe less than $800 a month (which is still outrageous with sticks and bricks going for as little as $1.10 per square foot) to a couple thousand in a real resort, even before club fees.
Zillow rentals in Tuscson, Yuma, Phoenix areas for relative apartment and condo costs, before committing to something in a trailer village.