The vehicle has a Trailer Sway Control (TSC) feature as part of the StabiliTrak system. If TSC detects that the trailer is swaying, the vehicle's brakes are automatically applied.

When TSC is applying the brakes, the TCS/StabiliTrak indicator light flashes to notify the driver to reduce speed. If the trailer continues to sway, StabiliTrak will reduce engine torque to help slow the vehicle.
TSC will not function if StabiliTrak is turned off. See Traction Control/ Electronic Stability Control.
Towing Equipment
Conversions and Add-Ons#99-09-40-005G: Seat Belt Extender Availability - (Aug 15, 2013) Primary Seat Belts
Subject:Seat Belt Extender AvailabilityModels: 2014 and Prior GM Cars and Trucks This bulletin has been revised to add the 2012-2014 model years. Please discard CorporateBulletin Number 99-09-40-005F.Important:DO NOT use belt extenders when securing a child restraint.The seat and shoulder belt r ...