Sorry, I didn't get any pix of the new sites, but I did watch the process which I can describe.
After removing the old concrete and tar approaches, they hacked out all the roots under the sites. In a couple of the pull-through sites, they took trees down that were close, in another they left the tree and dog-legged the site around it. We'll see how that works.
The holes left after excavation were universally filled with water. They framed out the site using 6X6 PT timber, lap jointed and wooden pegged. I'm not sure how or even if they attached the framing to the ground.
Then they brought in some washed sand, but not beach sand. It was more course and it packed down quite a bit with compacters. The little Bobcat that they were using got quite the workout. The final grade of the sand was 3" below the framing.
Topped off with compacted pea stone, I believe it was 3/8. I saw a few of the new sites with motor homes and there were no ruts where the wheels went. As I mentioned, the drainage was excellent.