I rode the stretch about ten years ago. I stayed in campgrounds where it fit my pace. I don't know what the rules are about backcountry sites, but I didn't get caught. You'll see plenty of rangers on Skyline. The rest of the parkway is not patrolled as heavily. When there wasn't a conveniently placed campground at the end of the day, I either packed it into the woods out of sight or didn't use the tent and hid behind a building or something. I remember it being fairly easy to find a good spot off the road. But that's ten years ago...