We're well behind the trend on Food Trucks.
Food Trucks in general have been around for a long time, but they were usually greasy poor-quality food. I think the recent trend towards non-traditional "gourmet" trucks started in San Francisco.
It appears that the most important things for having a successful food truck are a quirky name (basically follow the same formula that Homer Simpson used when naming the "Be Sharps"), a quirky menu, and the extensive use of social media to promote your roving location.
The Food Network even had a Food Truck race reality show:
http://www.foodnetwork.com/the-great...ace/index.html