Indiana Code Title 9. Motor Vehicles § 9-19-4-2

Sec. 2. When operated upon a highway, a motor vehicle registered as a truck with a declared gross weight of not more than eleven thousand (11,000) pounds must be equipped with bumpers of substantial construction on the extreme front and the extreme rear of the vehicle.  The height of the front and rear bumpers may not exceed thirty (30) inches when measured from level pavement to the bottom of the bumper.