Federal law requires that safety cables be used when towing. The capacity for each cable needs to exceed the weight of the vehicle being towed. It is important to insure the cable retention clip is operational. These could be the spring clip or neoprene keeper that makes it impossible for the safety cable to come unhooked. Cables should be frequently inspected for fraying. Frayed or worn cables should be replaced. It is crucial to make sure the cables are clear of any pinch points.