In San Francisco, we knock on the door at Sam's Chowder House for some of the freshest street food by the bay, like a tasty Maine lobster roll and a perfect shrimp po' boy. Next stop is Houston, Texas, where the Waffle Bus is delivering no-nonsense chicken and waffles, a s'mores waffle and even a strawberry Irish creme brulee waffle for those who dare. Then we rock up in Nashville at the Mere Bulles truck for a little taste of Southern hospitality that includes a macaroni and cheese burger and blue cheese chips. Lastly, it's a pizza emergency in Las Vegas, Nev., where the Engine 1 fire truck is putting out hunger one pizza at a time with their double stuffed pepperoni, barbecue chicken and yummy dessert varieties.