Larry and Liz
I have sent you a private message.
Sẁiẁs is a popular campsite, so you need to plan ahead and be patient if you want to stay there.
As you say, there are few reservations open for this year, and going without reservations after September 12 is not recommended.
You best strategy might be to plan for next year.
2003 Subaru Forester
2012 Toyota Highlander V6
2010 Escape 13 "Ladybug" Feb 2010