What I have built here is a tri-axle semi tow truck (heavy duty wrecker). I built it using pictures of real trucks with the same features. It has moving parts, opening cabinets, lots of lights and lots of tires.
I built this to express my interest in the big trucks I work on for a living and also to test my LEGO skills. It took my roughly 30 hours, and I enjoyed every minute. I believe this would make a good LEGO set because it uses all types of LEGO and can really showcase what can be done with these great bricks.