There was an article in FOUR WHEELER magasine about this a while back... In MN there are laws for the headlights and bumpers. Suspension isn't supposed to be more than 6" higher than stock. Body lift doesn't matter. Tires are supposed to be covered. I don't think many cops enforce these rules, I was never pulled over or even questioned about having my rear bumper too high and tires sticking out a ways from the flares on my lifted cherokee...