The drawbar/towing connection must:

• Be strong enough to pull all towed weight.
• Not be more than 15 feet long unless you are towing poles, pipes, machinery, or other objects that cannot be easily taken apart.
• Have a white flag at least 12 inches square attached to it if it is chain, rope, or cable.
• All of the above.
  Explanation:

  "The drawbar or towing connection must be strong enough to pull all towed weight, and it should not be more than 15 feet long unless you are towing poles, pipes, machinery, or other objects that cannot be easily taken apart. Additionally, if the connection is made with a chain, rope, or cable, a white flag at least 12 inches square must be attached."