Even though my used GL1800 2005 Lehman trike had a trailer hitch when I purchased it, I did not see a trailer plug so ordered the relay interface from Wingstuff. However when I was preparing to install the interface, I found a cable tie-wrapped to bottom frame of my Lehman trike. It turned out that someone had already installed the relay interface (next to the trunk, at the very rear of the seat) but never installed the plug at the end of the five-wire cable. So I simply had to attach the five wires to the trailer plug and my new Aluma MCT trailer with it's LED lights now works perfectly. Thought I would pass this on in case it might help another Lehman trike owner in the future.
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