Haldex TRS Trailer Rollover Stability System reduces the potential of combination vehicle rollovers by monitoring the trailer's speed and lateral force 100 times per second. The trailer-based TRS delivers superior 4S/2M ABS braking performance by adjusting for the trailer conditions during normal and ABS braking events as well as reacting if conditions indicate a rollover is imminent. If a rollover is imminent, TRS applies the trailer brakes to slow and stabilize the tractor/trailer.