Over the last few years we have booked our early June trips about 30-45 days out no issue. Even while we are there for our week there was plenty of open sites throughout the fort. About 2 weeks ago we wanted to reserve (full hookup). Everything was booked except premium 2nd week of June, which we took. Went to add two more days yesterday but was only able to add one day to bring to 7 nights. What happened this year?? Why so full already in June? I think full hookup wasn't available until July for a full week.