Food trucks a huge trend.
As Ken points out, real food trucks will specialize in certain types of cuisine.
My experience was Mexican food from them about 15 years ago. And it's been growing consistently since then all over the country. Hawaii, New York, Chicago, LA -- it's been happening everywhere. Las Vegas is late to this.
Certain ones get known, and people will go where they park on a regular basis.
Then they started specializing more. With twitter, people follow their locations.
Portland, Oregon even has parking lots to encourage the activity.