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It's often a legal requirement to have two safety chains, except on fifth-wheel trailers, and they should run crosswise between the tower and towee. That way, should something in the connection fail, the trailer is limited as to how much it can sway and move in general, making it feasible to come to a safe stop. With some luck, the coupler may not even hit the ground and get ruined. In California, the chains can't legally be any longer than necessary for making tight turns, and open hooks aren't allowed. Improperly secured hitch pins and worn-out couplers seem to be the most common causes for the safety chains having to take over. View Related Article
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