Pueble del Sol is closing its doors May 1, so if your coming in April, your in luck.
Mountain View is nice, gravel, but sites are close. We looked into this a few years ago, and things may have changed by now. It's directly behind RV World, (dealership on Hwy 90) and hard to spot. There is a road, just at the south end of the RV display. If you go too fast you'll miss it. That's in Huachucha City, much closer than Tombstone Territories.
Tombstone Territories is better, but as Ned said it's in the middle of nowhere.
The Caverns, just west of Hwy 90 on Hwy 82. Adequate. Two week stay only, but they will honor any club discount you have, so pick the one with the biggest discount. I think they will only honor Passport America for a couple of days, not the full two weeks.
Most of the others around Sierra Vista are dumps, a very few are doable, for a short stay.
Whenare you planning on coming. We live here.
Daisy T