General Motors is looking to change that a truck takes longer to brake when it has a trailer in tow, using existing equipment like its segment-exclusive eBoost braking system to allow truck-and-trailer to brake to a halt as quickly as a truck all by its lonesome. To demonstrate, the Detroit automaker showed off its new trailer braking concept in a video on Tuesday, and although the trailer used in the demo had to be specially prepared for this duty, the required technology is already well established.