In addition to being covered with images of storm troopers, the number TK421, and strange Star Wars-esque writing (undoubtedly authentic), it also had the license plate TK421.
I've looked it up on the web, and TK421 turns out to be the id of one of the storm troopers whose uniform is stolen by Han and Luke in StarWars. I believe the image at right is the dear boy.
The question remains: how big a Star Wars fan do you have to be to paint your vehicle in homage to a character who is pretty much only the answer to a trivia question? And I wonder what the resale value is.
Nemo has pointed out that this is not a picture of TK421. Rather, in this image: "Luke is in the armor giving the impression that the radio is out so that the security men will open the door thus allowing Han and Chewie to take the control station." So, rather than TK421, this is an image of how TK421 would have looked in uniform if he'd been a bit shorter. Thanks, Nemo!