A “pole or pipe dolly” is a vehicle, other than a motor vehicle, having one or more axles which axles, if there be more than one, are not more than 54 inches apart, and two or more wheels, used in connection with a motor vehicle solely for the purpose of transporting poles, timbers, pipes, or integral structural materials and connected with the towing vehicle both by chain, rope, cable, or drawbar, and by the load, without any part of the weight of the dolly resting upon the towing vehicle.