We snowbirded 4 years in a row at Countryside (on Idaho Road) in Apache Junction.
Wonderful time, wonderful people (except the French Canadians who absolutely refused to mix. And, of course, like always, only ONE woman spoke English. Fraud. I wonder why they do that......)
Edited to say: when making reservations, I strongly suggest you call the park itself (ANY park any time you want to reserve) rather than the centralized reservation company.
The park office KNOWS the park. Not just a computer screen at the other place. Just my experience(s).