I own a 2019 RX-350 that was not factory delivered with the towing package. I have since installed an after market receiver hitch to allow me to add a bike rack. Having a hitch opens the option to tow a small trailer (emphasis on small) but I will need trailer lights. Does anyone know anything about the trailer light wiring harness that comes with the Lexus towing package? I've been looking for part numbers for the harness and thus far have found nothing.