I have read all of the posts, and I know this should be easy, but I am still confused. I have an 08 Lexus, I assume it is wired like a Toyota. It has a 7 round connector already wired and mounted. I have a Ranger with a 5 flat. Is there an adapter I can just plug my 5 flat into and then into the 7 round so my surge brakes will allow me to back up and my reverse lights on the trailer will work?

Thanks