If you use RVParkreviews.com please post there as it will be a warning to others. On very few (like 2 or 3) occasions over the last 35+ years I pulled in without a reservation and accepted the safe site that was offered for the night. Only once, in Tucson some 30 years was a park so icky that we left before coffee. Now a days we call ahead with the cell at about noonish to ask if we can come in that same evening, this only if we have not made reservations long in advance. There is really no excuse for poor customer service. Your negative post will do nothing for their business model.
Better luck with the rest of your travels, and Happy Trails.