This is the system I have it is very basic. First there is a plate attached to the frame of the towed vehicle and a light cable is also wired in so your towed car has brake lights and turn signals. Then there is the tow bar mine is a basic “A” frame this attaches the two vehicles. An “A” frame is none adjustable and is a PIA to attach to the RV with only one person doing the work. I don’t have an auxiliary braking system on mine because my towed vehicle is only 2400 lbs. I should have a brake system it is the safest thing to do. When I stop the RV I have over a ton pushing the RV from the towed car and that’s not a good thing.