A motor vehicle towing a trailer must be securely held together by a drawbar or other connection.
The device, which attaches the trailer to the motor vehicle, must be firmly attached to a structurally adequate and integral part of the frame of each vehicle. If the towed vehicle is a gross vehicle mass less than 900 kg the device which attaches the trailer to the motor vehicle must be firmly attached to a structurally adequate part of the towing vehicle and to an integral part of the frame of the towed vehicle.
A motor vehicle towing a trailer must also be equipped and connected with an auxiliary coupling device that consists of a chain or metal cable equal in strength to the principal coupling device. This rule does not apply if the coupling device is a 5thwheel and kingpin assembly used to couple a semitrailer to a truck tractor and that assembly is securely attached to the towing vehicle. Also, the vehicle must not be operated with fewer bolts than were provided by the manufacturer or with any cracks or breaks in the securing attachments.
If a towing motor vehicle is equipped with a 5th-wheel assembly, the jaw closure mechanism and locking components must function properly and the frame assembly must be fitted with slide rails properly mounted to ensure that the trailer kingpin is securely engaged.
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