I would use Little a Dealer service. If you need service for warranty ask for Phill. I have used Camping World for most our camping supplies.
Ft. McDowell will be pretty toasty if you plan going in Aug. We do love our state parks. They are usually larger sites. Several of them have full hookups. They also have a Jr Ranger program for the grand kids. DD has done most of them. Fun for them. Fools Hollow Lake in Show Low is one of our favorites. The Mallard loop has full hookups. Other state parks have electric, water and a dump station on site.
Our maiden voyage was at Payson Campground and RV Park. It was a former KOA so sites were tight. Lots of seasonal residents also. Https://www.paysoncampground.com
My friend really likes Point of Rocks in Prescott. http://www.pointofrockscampground.com
hopefully this will give you some ideas.
Being you have a hybrid, I would suggest you cover the bunk ends to reduce condensation during colder temps. This also works when using your A/C. We used http://www.popupgizmos.com
on our Pop up for 9 yrs. never had issues with condensation. We had the high wind version due to the winds up north.
Chula Vista Resort will be nice for you.
Please feel free to PM if you have any questions. Take care and enjoy.