Many people thought food trucks were a passing trend, but it looks like they are here to stay. These mobile restaurants have come a long way since ice cream and hot dogs, with trucks today running the gamut from gourmet cupcakes to sandwiches to ethnic fusion street food. If you can nail a solid concept and dream up a menu, chances are you can carve out a food truck niche. As these mobile restaurants continue to evolve, so will their menus. With low start-up costs and high mobility-they can show up in rural areas, weddings, or other private parties-food trucks can be a great way to share your culinary ideas with the world.