It is certainly not for everyone but I'm totally into the food truck idea for a casual outdoor wedding. I went to a wedding in Napa last May where they did it for a rehearsal dinner and it was fab and fun! http://www.youtube.com/watch?v=Di77-Ivb15E
Intrigued? In our area (can you believe?), check-out The Rocket Truck!! ... Rocket Street Food, Big Fan! And, El Camion in Woodbury, CT.