OAR 734-071-0030: Equipment Requirements

(1) In vehicle combinations featuring more than one trailer or semitrailer, the shortest trailer shall be positioned to the rear of the combination, except that a motor carrier may position the shortest trailer at the front when it is more than 1,500 pounds heavier than the other trailer or semitrailer. (2) A tow dolly, designed to support one axle of a towed vehicle, may be utilized when one vehicle is towing another. The towing vehicle must be a full size motor vehicle (e.g., truck, motor home, automobile or pickup). Compact or subcompact motor vehicles shall not be used. It is recommended that: (a) The vehicle being towed not exceed the weight limitations recommended by the tow dolly manufacturer; and (b) The towing vehicle must not exceed the manufacturer’s rated towing capacity.