We have spent the last four winters in AJ, and bought last year in a park there. There are a lot of great parks, some reasonable and some quite expensive. One thing to be aware of if you buy in a park where you don't own the land your rent can be quite high ( over $500 per month for 12 months of the year), tho the trailers are ususally much more reasonable.
Other parks ( and there aren't very many in the Phoenix area) you do own your own land. This is the type we bought in last year, it had been our 3rd winter in this park, just renting. Our total fees, insurance, taxes etc for the year are around $2800, tho we did probably pay a bit more for the trailer. Also we like the fact that the park is owned and run by the people who own the land/trailers, so you have a say in what is going on. Everyone has been wonderfull in the park, so many activities, and looked after very well. Of course, when we started looking, a quilting group was a must!!
If you want any more info on the area, parks etc. just e-mail me.
Laurie