Buy a Thousand Trails zonepass (SW) then add the trails collection. You can stay at Mesa Spirit for 14 nights then a weeknin a State Park then 2 weeks at Golden Sun in AJ.
I upgraded to a lifetime membership after trying on for size using the above program.
Now I can stay 21 days in Flagstaff and back to an Encore park for 14 days.
Cal Am...another system has a great Fall program.