Things get rolling at Roli Roti, a mobile truck in San Francisco, with a built in chicken and pork rotisserie, which serves up succulent sandwiches topped with "crispy skin." For meatballs with an international appeal, folks flock to Great Balls on Tires in Los Angeles. Next we head to Rebel Heroes, a mobile truck in Washington, which serves Vietnamese-Cuban inspired banh mi sandwiches by a mom and daughter team. And in Philadelphia, La Dominique Creperie is a mobile cart serving sweet and savory French-style, thin battered crepes, with an artist's touch.