Remote but accessible primitive camping
Tldr: A 4wd dirt road out to the canyon with primitive (open dirt) campsites and a few fire rings.
The sheeps bridge road that gets out through the campsites has camping options from right off the highways to deep into the fields by the virgin river canyon. All are primitive, and many have fire rings. I did see some RVs near the highway, but no hookups or dump sites. A number of hiking and off roading shortcuts can get you in and around the area. While there are no large rocks to worry about, after the first couple miles its best to have a four wheel drive high clearance vehicle, as the roads get rutted and in rain very muddy. I made it around easily in a Mitsubishi outlander sport with 4wd. Many campsites are clearly visible by the signage as well as visible fire rings. The fire rings have spikes and mounts for convenience. Due to the elevation and canyon, this area is slightly warmer in the winter, and was not snowed over when the rest of zion was, so it made for good camping (the ground was still frozen). My friend and I had no trouble staking down, and the local gas stations (less than 30 min drive in any direction) all had firewood in the winter. We drove and hiked into the canyon easily from the campsite. Overall a fantastic primitive campsite for good canyon access, nearby hikes, and a few non sandstone climbs/boulders during rainy seasons.