What additional safety feature is provided by safety chains?

Safety chains are critical components in towing setups, as they serve an important purpose in ensuring the connection between the tow vehicle and the towed vehicle. Their primary function is to prevent the two vehicles from separating in the event that the primary hitch fails. This adds an essential layer of safety, as even if the hitch connection becomes unhooked or breaks, the safety chains will typically keep the towed vehicle connected to the tow vehicle, reducing the risk of accidents and uncontrolled movements.

The other options do not accurately describe the function of safety chains. They are not designed to enhance vehicle load capacity, protect the paintwork of the vehicles, or secure additional luggage. The focus of safety chains is solely on maintaining the connection between the vehicles during transport, making it a vital safety feature in towing scenarios.