Good luck
I always try to prepare for the best by looking at the maps. Some sites are not always available. Short stays during the week will sometimes get you a great site if you reserve something and a better site is available try to upgrade
that's a maybe. I'd have alternates too.
The site we stayed in (a sun/mon trip, on the ridge, highly desirable) was booked out at least six weeks. I don't know if they save sites for day-of arrivals. The reservation website is fairly navigable, but not the easiest.
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