Turning onto FS-222 is probably the worst part of the road that we experienced. Decent gravel with some slight washboard. There are practically infinite camping spots out here, big rigs included.
We had checked out two other sites in the Flagstaff area before landing here. We liked the selection of sites here the best and also have pretty good cell service. Great location to explore the area!
We were able to secure a super secluded spot for our 36 ft rig about a mile in with some tricky maneuvering. A little bit of garbage, but it wasn't trashed. I wouldn't bring anyone here that isn't comfortable with guns, as there is tons of noise coming from a nearby range. I would recommend camping near the beginning or take a right when the road forks and camp past there. The gun range is to the left and people shoot until around 11pm in our experience.
Also be careful of kids and pets bear the road, especially on weekends. Idiots were flying by going at least 60 mph on dirt bikes. Most riders were respectful though.