I have Roadmaster equipment with Sterling tow bar on my Wrangler. Also Brake Buddy brake on Jeep.
There is a cable kit that you can get (forgot who - will find out if you want) that hooks the lights in the Jeep to the MH through the umbilical -- running, turn and brake. I chose to run that cable from the rear of the Jeep to the front through the frame rail of the Jeep - a little challenging, but nice result.
The Brake Buddy sends an air signal to the unit in the MH telling you when the brakes are applied. Not trusting that alone, I set up a microswitch off the Jeep brake pedal, and ran the wire through an unused wire in the umbilical to a red light I mounted on the MH dash. Now, when the Brake Buddy activates, I see the air signal, plus it being verified by the "microswitch" light. Also, I installed a dedicated outlet for the Brake Buddy near the left foot panel, not relying on the weak outlets the factory put in.
Finally, I ran a charge line from the MH to the Jeep to keep up with any Brake Buddy draw.