It ain't rocket science: Cupcakes. South Jersey's first mobile cake manufacturer churns out the signature dessert with flavors both standard and special. Each gourmet cupcake - and they're sizable, not those miniature two-bite deals - will cost you $2.25. Save, as the saying goes, when you buy in bulk. A sixpack goes for $12. If cake isn't your bag, the truck also offers Philly favorite water ice during the summer.