stay-in-play operating unty senses coach deceleration and uses the signals from the unwanted or unnecessary brake activations on grades or over hitchboss towing organizer keeps your towing harnesses and chains off the ground and easy to reach gr innovations hitchboss towing organizer for 7-way harness gr innovations hitchboss towing organizer for 4-way harness designed to keep your safety chains up off the road while towing and prevents sparking gr innovations class 3 hitch safety chain hanger gr innovations class 5 hitch safety chain hanger air force one operating unit rv brakes tire pressure monitoring unlimited product expansion rv level • proportional braking • uses coach's air supply and is completely automatic-nothing to adjust • patented process creates vacuum in towed car's power brake system •breakaway system brakes towed car if it becomes separated • all components install out of sight on coach and towed car completely universal and transferrable • patented direct-pull actuator-no pulleys your towed car proportionally and requires no wiring or installation in your against the floor pan in the towed vehicle instead of the soft seat when hitch & tow catalog & internet only