If you go to the state park website you can get the info on each sight.
There is, make sure you check out the sites before going (If possible) there are some sites that are way bigger then others. If you can't get there prior and the site you book is on the smaller size just take a stroll around and look at the empty sites, if you find one you'd rather be in all you have to do is check with the office and see if anyone has reserved for when you're gonna be there. They're very flexible with moving sites. The loop manager can also help you with moving, especially if it's the weekend and the rangers aren't in the office. Find out who the loop rep/manager is when you get there, they can be very helpful. Hope this helps. Enjoy.
Half of the loop does have rv hook-ups and the others don't. Make sure you check the website for amenities before booking if you are camping with an RV. Google maps is great for getting an overall look at a site before booking. You can zoom in and see the layout of the area. As for parking rather than camping, the individual sites aren't very big in the rv section of the loop. You can only fit one per site, and the rules only permit one vehicle per site if you bring multiple cars. I believe there is a separate parking lot at the bottom of the park for additional vehicles.
Thanks! Your answer is awaiting moderation.