So i like the look of the 4th gen trailer controller and I was wondering does the controller directly control the output (aka no communication to tipm apart from GIVE ME POWER) or is it merely an interface to the later gen TIPM's and that handles switching. because i dont like how the new ones look stuck on and i like the manual activation slide levers/buttons to actuate JUST the trailer brakes as hard as i want and not just a on/off because that helps with trailer sway if you mess up. This is the kind I'm looking at.