My two cents
July is very very hot in the Southwest. Daytime average is 108 drgrees.
If you must go in July, I would plan early morning, and evening outside time, and siesta in the afternoon.
Getting up to watch a sunset is a great idea. But don't forget stargazing.
Find out when the moon is down, turn off all of your lights, give your eyes 30 minutes to adjust.
Campground??? I don't think it matters much. For me, the Southwest isn't a place to hang around the campsite.