I agree with Mike. That bus needs to sit at the front of Camp Schoeller and that is going to take getting there very early. I would surmise a week ahead might not be too early. You need to sign up to be an EAA member to camp there. If you are late and have to be in the back your traffic will be nil.

Ebay. That's the answer. Take what you can get, lick your wounds amd move on.