The only OC truck that I've hit up is Kogi (after I had them in LA). I love their Black Jack Quesadilla and short rib tacos. I dig that they have a truck specifically for OC too... On a perfect night I can hit up the Bruery and get some fusion food!
I've only seen them in OC once (at the Bruery), but The Fry Smith
is my favorite truck of all time!!! They make these Sweet Po' fries that are to die for! And the Kimchee Fries are bomb too. Hit um up if you ever see them. Greatness on wheels!