Those are the trailer wheels, I'm sure. Probably set up for monster truck tires, and gets pulled to douche bag shows on a trailer that it too narrow to fit the giant wheels and tires he has (look at the spare).
its one of two things: (1) its going to be trailered somewhere and won't fit on the trailer with the larger tires or (2) its still be built and just has the small tires on it to get around the garage. Seeing how clean everything with no rust and exceptionally black paint on the frame, I doubt its ever sniffed a trail. so I think its still being built.