Photograph from BigGreenPizzaTruck.com

This pizza wagon one-ups any pizza truck on the streets of Manhattan. And then some:

Several years ago Douglas Coffin, a caterer in New Haven, built a portable bread oven that he planned to use at big events. When that did not work out (not cost-effective) he decided to put a wood-fired oven aboard a truck, drive to company picnics and birthday parties and make thin-crust pizzas for his clients.

The Big Green Pizza Truck
First the Pizza's Delivered. Then It's Cooked [New York Times]