mrmatt........
anything that enters the parking lot must have a pass, be it a daily or yearly. passes are the same price for a truck or any bike, $24/year or $4/day, and out of state prices go up a few bucks. Your best bet is to have someone take your bike in with them and buy a day pass, then you wont have to pay for your truck.
All passes can be purchased at the gate, only takes a few seconds. Also the will check for alcohol there, i know from experience.