We have a home in Sun City West as well.
The Sun City RV Compound is an incredible deal if you are a member of the Recreation Center. Located a short distance off Bell Avenue. When I am in town, I store my RV there and the cost is based on RV length and as I recall it is something like $140 a year for my Casita Travel Trailer. They have air, water, dump and wash centers there. Security is excellent there with electronic check in and out.
Orangewood RV Center is almost next door with propane and anything else you need.
http://www.scrvcompound.com/
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
Mark Twain