Heather Shouse joins the guys to discuss her book, Food Trucks: Dispatches and Recipes from the Kitchens on Wheels. Food Trucks is a book that profiles some 50 different food truck operations from across the United States. The discussion leads to the economics of food trucks and how they differ from city to city, from cities that don't allow food trucks to those that embrace them, to differences between trucks and the kinds of food that can be cooked inside a truck. Mark, Francis, and Heather also share some of their favorite food trucks across the nation and discuss what makes a food truck great....