Thanks, Michael for posting your question. As far as I know there are no services at all at the campsite I have in mind, but there is a road that seems to lead to the river off of the Perkensiville-Jerome Road, and it appears to be well-graded.
Last weekend I even saw that a group had arranged a camp there, and had left 2 cars by the Perkensiville-Jerome Road to direct people, and those two cars were regular low clearance 2-wheel drive cars, so the road there must be well graded all of the way to the river. But, I doubt if there is even an outhouse down there, let alone drinking water, but the river runs year round, and has beavers and water fowl, blue heron, etc.
I do plan to drive the road at some point, and do some camping there soon to check it out. Photos will follow.
By the way, my road navigation GPS has the Perkensiville-Jerome Road, and this side forest service road on it. I have an older GPS, which I found had all of the Forest Service Roads, as well as all of the paved roads, up to a few years ago. I plan to take that extra GPS with me, and log the campsite on both GPSes, so that either GPS could be used to navigate to the site from anywhere in the world. So, I could send you my spare GPS for you to navigate to the winter retreat site, wherever it turns out to be, if you are interested.
Yesterday I drove round trip on the Chino Valley-Perkensiville-Jerome Road to retrieve my bus and finish cleaning out the warehouse in Chino Valley. So, I do not expect to be back along that road until I am ready to do more scouting for campsites for future retreats.