Ah, street vendors. Those were the days. Staring at questionable franks and greasy cheese-steaks will never be the same. The market is changing, and food trucks are all the rave on street corners, at sports events, and on college campuses. Just think, you can now purchase street food from a really nice vehicle instead of that cantankerous old street cart. Nissan recently showcased its new food truck concepts at the 2011 Auto Show. These food trucks feature work counters, custom fold-out serving windows, and full exterior graphics. The Grilled Cheese Truck and the Coolhaus [Ice Cream] Truck made their debuts with delicious fare in tow.