Just re-read your post. Just make sure your battery is secure. No floor mats/ANYTHING in the car, at all. Wouldn't worry about the carpet. They will check your wheel bearings, controls, battery and a few other things. Maybe bring some blue painters tape if you have some.
Every event I have been to they want you to run. If there is a problem they try to get it fixed and get you out there. You are in a good location, maybe not for size but definitely for quality.

