I don't know if they are out there pulling people over and measuring bumper height but this is the law.
http://www.truckworld.com/How-To-Tech/97-lift-laws/lift-laws.html
http://www.genxj.com/state.htm
http://www.jeepgod.net/liftlaws.html
MINNESOTA
The maximum legal height for bumpers is 25 inches from the bottom of the bumper to the ground. If you attach something to the bumper to make it conform to the legal height, it must be just as strong as the factory bumper or meet SAE standards. Simply bolting on pieces of wood or metal isn't gonna cut it folks. If you slap on a lift kit, you might actually be required to register your truck as a "reconstructed" vehicle, and that would mean you'll have to pay additional road-use tax and need an inspection where a new VIN would be applied.
http://www.truckworld.com/How-To-Tech/97-lift-laws/lift-laws.html
http://www.genxj.com/state.htm
http://www.jeepgod.net/liftlaws.html
MINNESOTA
The maximum legal height for bumpers is 25 inches from the bottom of the bumper to the ground. If you attach something to the bumper to make it conform to the legal height, it must be just as strong as the factory bumper or meet SAE standards. Simply bolting on pieces of wood or metal isn't gonna cut it folks. If you slap on a lift kit, you might actually be required to register your truck as a "reconstructed" vehicle, and that would mean you'll have to pay additional road-use tax and need an inspection where a new VIN would be applied.