Without knowing whether PB has altered the size of the two camping areas onsite in the wake of the flood
, you will definitely have to squeeze in. I'd also say, with the late arrival, unless you have some medical or other urgent need to have your car, ditch the vehicle pass because finding a spot onsite at that point will be tough.
You can drive in and drop your stuff off onsite then leave it at Bohn for the rest of the weekend. Remember that not only the listeners will have set up at that point, but all the Academy attendees will have set up camp for a week before you get there.
Nonetheless, festivarians will no doubt make room for you and yours!