I know we have been back and forth a couple of times on the MCE flatties and how we're going to do the rear tubs. Anyway, I talked to a buddy of mine who's a patrolman in the Palos area; he said he never heard of a tire coverage law for passenger vehicles. I'm not saying that's gospel, but I really can't see getting pulled over for that. Inspections might be another story, however. I did see a rig in the Naperville area that had flats in the front and the rears were sticking a good 2" out of the rear tubs.
I also checked here:
625*ILCS*5/**Illinois Vehicle Code.
and found nothing on tire coverage for class 1 vehicles (any passenger vehicle intended for not more than 10 passengers.) There is a fender clause regarding "splash guards" for class 2 vehicles, which details tire coverage mandates, but this does not include passenger vehicles.
I'm going to do it soon as it warms up. Guess I'll be a guinea pig, but I'm not worried.