What is the effect of electric trailer brakes on stopping distance when towing a trailer?

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When towing a trailer, the braking system works with both the tow vehicle and the trailer to resist the overall momentum of the combo. Electric trailer brakes add braking force to the trailer wheels, controlled by a brake controller in the tow vehicle. Since the trailer has mass, applying brakes to the trailer helps slow the entire setup faster and more smoothly, reducing the total stopping distance and improving stability. The controller typically adjusts braking force to the trailer in proportion to pedal input, so the trailer and tow vehicle decelerate together. Without properly functioning trailer brakes, the tow vehicle would have to stop more of the load on its own, leading to longer stopping distances and more wear on its brakes.