All good replies. Yes we have been attempting to book at the maximum allowable booking window, 6 months and then you can reserve an additional 13 or 14 days from that date. We're all over it the first day that a site in that campground comes available. We've went so far as to have 3 family members on different computers with the USNO clock running in an adjacent window and then staggering when we hit the BOOK NOW button. One will go 2 seconds early, one will go 1 second early and the last one will hit right on time. The person that hits 3 seconds early usually get the TRY LATER message while the others get INVENTORY IS NO LONGER AVAILABLE message. It doesn't appear that there's really any trick other than to keep trying. Thanks for your responses.
Al
