They call their business The Rolling Stonebaker.Their home page has a couple of neat pictures of their truck.
The article says in part:
Georgian and Chaddock cooked up the idea of The Rolling Stonebaker pizza truck, a reconfigured 1949 Studebaker fire truck that debuted last summer at Michiana private parties, farmers' markets and impromptu roadside events. The Stonebaker serves pizza from a wood-fired brick oven at the rear of the truck. The Stonebaker was so popular the Beverly Shores, Indiana, couple purchased a second antique Missouri truck for this season, which runs through Thanksgiving.It's clear from their site that they move around a lot.