Is an additional coupling device such as a chain or cable required when a coupling device other than a fifth wheel is used to join vehicles?

When connecting vehicles using a coupling device other than a fifth wheel, an additional coupling device such as a chain or cable is generally required to ensure safety. This requirement is crucial for maintaining vehicle control and preventing uncoupling during transit.

The additional coupling device provides an extra layer of security; in the event that the primary attachment fails for any reason, the chain or cable will help to keep the vehicles connected, minimizing the risk of a dangerous situation. This practice is standard across many jurisdictions and is essential for safe trailer operation, particularly with heavier trailers that can pose serious hazards if they detach unexpectedly.

While some manufacturers may specify different requirements based on their designs or safety standards, the inclusion of an additional coupling device is a widely accepted safety measure in the industry. Adhering to this practice contributes to overall road safety and is a key consideration for drivers operating heavy trailers.