It's a "C.Y.A." maneuver for the wheel manufacturers. Somebody, somewhere probably installed trailer wheels on a car and then got into a wreck. Then the people he hit (or their estate) took the wheel manufacturer to the cleaners for a big damage settlement. When a fire hydrant watering competition gets declared between bean counters and engineers, the bean counters win every time!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!