Towing 4-wheels down.....braking required for vehicle?

Take a good look at the NAS Ready Brake kit. The brake actuator sits between the receiver and the tow bar. An aircraft quality wire runs between the brake actuator and the brake pedal on the Jeep. (There are actually two wires but the connect together). Easy to set up, virtually fool proof, no power needed at the Jeep.

NAS also has the same type setup in case the tow bar fails for emergency braking.