On which vehicles are safety chains primarily used?

Safety chains are primarily used on wheel lifts and slings to provide an additional layer of security and safety when towing or transporting a vehicle. The purpose of safety chains is to ensure that even if a primary connection were to fail, the towed vehicle would still be attached to the towing vehicle, thus preventing accidents and ensuring safety on the road.

In the context of vehicle towing operations, wheel lifts and slings are mechanisms that can easily disconnect or experience failure during transport. The use of safety chains creates a backup system that provides peace of mind for both the driver and the public.

While the other options may mention specific types of vehicles where safety chains could potentially be used, they are not the primary application. Car carriers, heavy-duty trucks, and recreational vehicles may have different towing requirements and configurations that do not emphasize the use of safety chains in the same critical way as with wheel lifts and slings, where the risk of disconnection is more pronounced.