I have one more set of tires to mount and I'm all set (I had to dismount 3 sets and mount 4 other full sets today...I'm getting sick of tires!). I will bring a small jack, and a torque wrench and breaker bar for tire mounting, plus another awning and a tire pressure gauge.
As far as classes, because of tires/mods I think everyone except Travis will end up in Street Prepared.
Technically Gary, you have a 'non-stock' cam which puts you into Prepared (Travis' class). But, it's been my experience that they'll possibly let that one indiscrepancy go since you're a 'one-timer' and generally not a threat to win the class.
For prep-work Gary, just make sure the car has a hard brake pedal and is full of brake fluid, and has seatbelts, tight lug nuts, and no loose wheel bearings. That's about it. I'll bring a spare helmet along besides my own. It's an SA90 which I believe is still legal for autocross. They let us use it for rallycross just last two weekends ago.
Bob