The CoE campground I was just in was site-specific reservations via recreation.gov. The downside to site-specific is that you're buying a "pig-in-a-poke" not really knowing what the site is like except what little you can see on Google Earth. If you arrive and find you don't like the site for some reason, well, you're just stuck.
But they usually give the length of the parking area so at least you have confidence you can get the rig in there.
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