.06 Rear Metal Frame.

Every trailer or semitrailer of a gross weight of 3,000 pounds or more when operated upon a highway shall be equipped with a permanent metal frame attached to the underside of the rear of the vehicle. The frame may not be any wider than the width of the vehicle and may not be more than 30 inches above the highway when moving and shall be constructed of heavy gauge steel. The maximum transverse distance from the widest part of the vehicle at the rear to the frame may not exceed 18 inches. The frame shall be constructed so as not to interfere with lights or other warning devices. Any trailer or semitrailer so constructed and maintained so that the body, chassis, or other parts thereof afford protection required by this section, shall be deemed to be in compliance. The provisions of this section do not apply to pole trailers or to vehicles where the installation of the required frame would prevent operation of the vehicle to secure its designed use.

Procedures: Reject Vehicle If:
A. Rear Metal Frame. Inspect frame for proper size, mounting, interference with lights or warning devices, and type of construction. A.
 (1) Rear protector frame does not conform to requirements.
 (2) Rear protector frame is missing when required.