What must be done with the safety chains when attaching them to the towing vehicle?

When attaching the safety chains to the towing vehicle, it is essential to cross them under the trailer's coupler to provide an extra layer of safety. This method creates a cradle effect that can catch the trailer coupler if it becomes disconnected from the hitch. If the chains are not crossed and the trailer disconnects, the trailer could drop to the ground, causing damage and potential hazards while on the road.

In addition to improving safety, crossing the chains also helps reduce the risk of swaying and improves stability during transport. The chains should be securely fastened but not overly tight, allowing for some flexibility during towing.

Other methods, such as leaving the chains straight or attaching them to the side of the trailer, do not provide the same level of safety and could lead to dangerous situations if the trailer becomes unhitched. Removing the chains when empty is also not advisable, as they need to be in place whenever the trailer is being towed to ensure safety in all conditions.