20' I would say would be the largest RV that would fit in this ten site campground. Pit toilet only, no electric or even trash dump. Most all the sites have fire rings and are in the trees. If you bring horses note there are no stalls, or places to tie your horse. There are riding trails. A few tenters and small class B were there when I stopped by.
$10 per night pack in and pack out only. I did see one sign for a water spigot that you needed to walk to and carry water out.
Sheyenne Oaks campground is a mile north of this camp spot run by USDA