Here's how the truck is going to work: Like before, it's really meant for families of riders (kids and their required supervisory units) to hang in the truck bed and wave to the crowd. Space is generally first come first serve - this shit is like Southwest, we don't assign seats and space may be oversold.
You're welcome to pay Bob for the shirts and plan to ride in the back of the truck, but be mindful of the space constraints of an 8' truck bed. Obviously small children get priority over anyone else, because they can't just hop out and walk. If it's too crammed with "truckies", able-bodied adults may have to walk along with their beers.
The cab is not available for passengers, please don't expect to put them in there. It usually gets filled up with gear and I don't want to deal with trying to pile people in there too.
And please remember truck rule #1: If you put a kid there, arrange for a grownup to be with them as well.