I saw the back of it first, and pulled into the first parking lot I could find to turn around for another look.
Unfortunately the best part was facing the street, so I couldn't get a shot of it without standing in traffic. Not my picture, but this is it: Biggest artwork on it.
I was able to get a shot of part of the side of the truck that served food:
The lighting was bad for my shot of the front of the truck:
This shot shows more of the front -- not my picture. The text read "The Museum". I guess the Thunder Cats Museum? I hadn't looked inside to see if they had toys or something in there.
Unfortunately they only sold Mexican food, and I don't like that, so I didn't order anything. Plus I was kind of embarrassed to be taking photos of it, but it was so cool I couldn't resist.