Dick,
A few high country possibilities:
Show Low:
Venture In RV Resort is on AZ260 near Torreon and Show Low CC. We've never stayed there but our neighbor in Show Low CC had a class A and would always stay there for about a week to check out their coach before heading south for the winter. They were very happy with the park.
Fools Hollow State Park is on Old Linden Road off AZ260. It has 50A and water and a central dump station. First come, first serve, but is usually easy to get into mid week. All slots are back in. Some have very nice lake views. Fishing from docks and cleaning stations available. Road in has a 26K lb rating but no one observes it as there are usually a number of class A coaches there. We used it when looking for a stick house in ShowLow.
Both of these parks are in Show Low and within a mile of the golf course if you play.
Pinetop:
There are a few parks in the area that we've stayed at but only one I'd even get close to recommending is the one at Hon-Dah casino. Has full hookups. IMHO there's nothing special about it but the time we stayed there it was relatively clean, etc. It fills up fairly fast so call as far ahead as possible.
Flagstaff:
Only park we've stayed at with a coach is Black Barts. It's behind Black Barts Steakhouse and Little America Hotel. Stayed there a number of years ago. Was OK, had pull throughs and full hookups w/50A, level gravel pads.
KOA was crowded and didn't seem set up for big rigs when were there a number of years ago in a trailer.
Jacob Lake:
Never stayed here but have been by them numerous times while hunting on the North Rim. Jacob Lake Campgound is less than a mile southwest of Jacob Lake. Looks OK, Usually busy in spring-fall season so call ahead. Jacob Lake Campground and Picnic area is right across the highway from Jacob Lake (restaurant, motel and service station). Not sure of facilities but looks OK.
Camp Verde:
Area will be a bit warmer than Flagstaff as it is 3100-3500'. Number of nice parks and many tourist attractions in area. Our favorite is Distant Drums across the interstate from Cliff Castle Casino. Resort style park with concrete pads and both pull throughs and back ins.
If you stay in the Show Low area, let me know when and maybe we can get together as we spend time at our place there in the summer.
Good Luck! Steve