Here are a few I think have short and long term:
pleasantharbor.com/rv-resort/ lake north of city of phoenix
Phoenix Metro RV Park - The Perfect RV Park In Phoenix Ariziona next to I-17 freeway, also north of city of phoenix
Pioneer RV Resort next to I-17 freeway, also north of city of phoenix
rvonthego.com/arizona/paradise-rv-resort/ age restricted, in Sun City a few miles North of Phoenix
Hope these help.