D. For a vehicle of 7,501 pounds to 10,000 pounds, 28 inches in the front and 30 inches in the rear.

Measurements must be taken from a level surface to the bottom of the frame end. For the purposes of this subsection, "frame end" means the point at which the frame rail terminates at the bumper assembly.

2. Modifications. A vehicle may not be modified to cause, under normal operation, the vehicle body or chassis to come into contact with the ground, expose the fuel tank to damage from collision or cause the wheels to come in contact with the body. The suspension and tire sizes of a vehicle may be modified pursuant to this chapter and rules established by the Chief of the State Police.

3. Suspension. An Except as provided in this subsection or in subsection 2, an original suspension system may not be disconnected. This section does not prohibit the installation of heavy duty equipment, including shock absorbers and overload springs, or prohibit a person from operating on a public way a motor vehicle with normal wear of the suspension system if normal wear does not affect control of the vehicle.