I use these magnetic towing lights. I bough a sheet of 1/16" rubber with an adhesive back to put under the tow light magnets so they won't scratch the car.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Also used this splitter, but only could use it with the 7 to 4 pin adaptor.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I was never able to find a 7 to 7 adaptor with a 4 pin tap. Could find 7 to 6/4 but never 7 to 7/4. So when I went to using my own controller, I tapped into new junction box I installed on the dolly tongue.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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