Does your trailer have a braked trailer hitch?see http://www.angleseymarinesupplies.com/resources/2000KG%20BRAKED%20TOWING%20HITCH%20KNOTT%20AVONRIDE.jpg.opt372x176o0,0s372x176.jpg The wire runs from the hitch to the rear wheels of the trailer and is activated by a spring in the hitch which gets compressed when the vehicle brakes.
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