'Pole trailer' means a vehicle that: (1) Has no motive power; (2) Is designed to be towed by another vehicle and attached to the towing vehicle by a reach or pole or by being boomed or otherwise secured to the towing vehicle; and (3) Ordinarily is used to transport long or irregularly shaped loads, such as poles, pipes, or structural members generally capable of sustaining themselves as beams between the supporting connections.
Maryland Legal Code