So how do you find this fabulous mobile food joint? Follow them on Twitter for their daily spot updates. Every morning they post where they will be for lunch and dinner, as well as if there are any specials for the day (like fried green tomatoes or carmelized onions to put on your burger). They usually end up at the same places on a regular basis and there's always a long line so get there early or call ahead to make sure they don't run out (which has happened before).
Only burger is a local staple. So log on and find out when they will be cooking up a fantastic burger near you!