What is meant by a ‘secondary coupling’ on a trailer?
A secondary coupling is a mechanical device, such as a chain or steel wire, that’s in addition to the main tow ball coupling. Its role is to the keep an un-braked trailer connected to the towing vehicle if the ball hitch becomes uncoupled. It should be strong enough to hold the fully-laden trailer to the vehicle and sufficiently short so the hitch doesn’t strike the floor if an under-slung skid is not used.
It is a legal requirement to have a secondary coupling on a trailer without brakes.
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