GMC Hosts Trailering Academy Featuring the 2014 Sierra | AutoMotoTV

Subscribe for more car videos: http://bit.ly/15DV2NN <br />GMC Hosts Trailering Academy Featuring the 2014 Sierra <br /> <br />Follow us @AutoMotoTV - http://www.twitter.com/AutoMotoTV <br />AutoMoto TV - http://www.youtube.com/AutoMotoTV