MICTUNING Heavy Duty 7 Way Plug Inline Trailer Cord with 7 Gang Junction Box - 8 Feet, Weatherproof

Since we’re starting from scratch, I needed to get a harness for the trailer lights. I’ll eventually get a hot lead from the battery in our tow vehicle back to the battery array in the Airstream but for now, this is good enough. This one comes with a nice junction box to keep everything clean and dry as well. Give it a shot!