An emerging phenomenon in Austin -- really, just areas south of the Colorado River -- are hipster food trailers. Hipster food trailers are usually Airstreams, and they usually don't sell the tacos one normally expects from "roach coaches"; trailers in Austin sell cupcakes, sushi, Middle Eastern food, Asian fusion cuisine and the like. Unlike the taco trucks, hipster food trailers tend to remain stationary.
From what I understand, hipster food trailers are increasingly common in Los Angeles and Portland. Are they common in any other places?