Duff Beer Truck?
It's just vanity. For more info Google wikisimpsons tap ball and go to the first link. That site is the best resource for this sort of thing.
Forum Discussion
- If you set it near most of the other vehicles it looks to scale however if you place the channel six news van near it, it makes the news van look like a clown car. I never noticed how small the van was before. :D
