Another cupcake truck... another cupcake... ho hum. My personal opinion is that if you have a food truck, your product still has to be able to sing on its own, without the novelty.
The cake was pretty good. It was nice and light and melted in your mouth. The icing was just "meh". I liked that they didn't over-ice the cake, but it could have used some more peanut butter flavour. It was also a bit warm which made everything feel really goopy. I'm sure the temperature was due to the fact that they're serving out of a running truck, but if that's how you want to serve it, you have to figure out how to regulate things.
A good treat if I happen to pass it, but I wouldn't hunt it down.