I have seen this truck around Los Angeles and after catching up with one in Scottsdale I found out that they have 3 in L.A. and 2 in Phoenix area.
I got the "fully loaded" which is sharp cheddar, macaroni and cheese, pulled pork, caramelized onions. The combo version of this comes with your choice of tomato soup or tater tots and a drink. The sandwich itself was great and has enough on it to fill you up but at $11.75 for the combo I was not happy with the soup. It was really chunky almost like chile, I think it would be much better paired with the grilled cheese if it was more like a bisque.
I will try it again next time I happen to see one of these trucks but without the soup.