Here is the only blurb about it I can find online "Silverado HD trucks are now available with an integrated trailer brake controller with instrument panel-mounted controls. Integrated with the ABS system, the controller provides immediate and measured brake force signaling to electric-controlled trailer brake systems. Since it?s fully integrated with the vehicle?s ABS and electric systems, there is no requirement for external and/or aftermarket brake control systems ? response is coordinated with the application of the vehicle brakes."