Would it be safe to presume that these are parks that do not have a 180 day booking window? Are these commercial campgrounds/RV resorts?
I've only been able to book 5 locations here in Colorado, based on the 180 booking window. January 4th is the opening of the window for the July 4th weekend here. I too have stayed up to just past midnight, only to find that apparently some of the booking windows are based on eastern time zone times. 8am mountain time gets me in to the booking window for certain locations.