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Trailer Boards

Trailer boards carry the rear lights from your towing vehicle to the trailer, so following traffic can see your brake, indicator, and tail signals. They clamp or mount across the back of a flat trailer, car transporter, or bicycle carrier, wired back to a standard 7-pin socket. Sizes run from 3 ft boards for bike racks up to 4 ft 6" for wide plant or car trailers. Some models add a fog lamp — required by law if your tow vehicle has one fitted. Cable length matters: short runs suit cycle carriers, longer leads work for big trailers or awkward hitch positions.

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Length should match or slightly exceed the width of your trailer deck — a 4 ft board leaves the outer edges of a 4 ft 6" trailer unlit, so size up if in doubt. SMD LED boards run cooler and draw less current than filament bulbs, useful if your vehicle's canbus system flags traditional lamps as faulty. Both types plug straight into a 7-pin ISO socket; if you have a 13-pin caravan plug, use an adaptor.

Cable length covers the distance from tow hitch to the mounting point on the trailer. A 2 m lead suits bicycle carriers that sit close to the car; 5 m or 6 m cables reach back along plant trailers or wide bed frames without stretching. Run the cable clear of moving parts — tie it off at intervals so it doesn't snag on the drawbar or drop onto the road. Fog lights are mandatory if your tow vehicle has rear fog lamps fitted. The board fog must illuminate when the vehicle's fog switch is on; check continuity with a test lamp before each trip. Replace cracked lenses and corroded sockets as soon as you spot them — a dim brake light or dead indicator earns a prohibition notice at a roadside check.