Edward from North Carolina on 12/30/2021 6:26:29 PM:
If you look under the campsite details it will tell you the maximum occupants. Some may have 6 or 8 max. occupants, but I think you might be pressed to set up that many tents in the space that is provided.
The Spring Gap and Antietam Creek campgrounds on the C&O had plenty of space, so you could probably set up ten tents in two sites.
The Outflow Campground space was more limited so you might get three tents in the provided space.
It might be better for you to get a group campsite, I saw Scout Troops using those on my trip last year.
Have a great trip, Edward