I have seen those lovely rubber flower planters, you know, tires turned inside out lining driveways, way out in the countrysides. Stop to think about it, most of them are flowerless but great decorations, and no one seems to steal them.
As for the wheels themselves, scrap metal, there is money to be made in them thar wheels.
Now for the real reason I bet you never thought of.....free fireworks.
Drive that vehicle down a paved road and the sparks will fly like nothing else on the fourth of July. There is one drawback, you can't play with matches when you set those fireworks off! You might want to watch out for the local law enforcer too, he might not appreciate the show unless maybe his name is Barney.