We spent three months at Pacific Dunes RV Ranch many years ago. I used to walk across the dunes and watch the RVs trying to get out on Sunday afternoon.
Took a blanket to sit on, and a couple of cold ones, and just watch. More fun than a three ring circus, and not nearly as well organized!
Running the dunes in a 4X4 was fun, but I would never take an RV to the beach! After three months of living in the RV Ranch, it took us months to get all the sand out of the fiver. It would be much worse on the beach!