We are home now. The wait wasn't too long, the truck is buried in a strip mall across the street from the Target strip mall near the Village. It was interesting, kind of illicit or something. Anyhow people were nice!
I had 2 of the short rib tacos, BK had 2 short rib tacos, 1 chicken and 1 pork tacos. Bks daughter had 1 short rib taco, 1 chicken and 1 pork taco and a kimchi quesadilla. I can verify that there was no fat anywhere on the short rib tacos I had, the meat was lean and tender and the flavor was a little sweet, a little smoky, a little spicy and altogether delicious. There was both lettuce, and cabbage mixed in with some chili oil, caramelized onions, vinegar a little sugar and the marinaded meat. Id eat it again anytime. Its totally worth chasing a taco truck in the dark...
My understanding is that they dont have a permit for OC yet so they kind of bury the truck and try not to attract too much attention, other than the people who follow them on twitter. Tons of Asians and Hispanics and a smattering of white people. The folks we talked to came from all over!
Give it a try, its actually a really nice experience!