GM Certified Used Vehicles Teams with SiSTeR Technologies to Add Video to Online Vehicle Listings. SiSTeR Technologies today announced that Sonic Automotive, Inc. (NYSE Listed: SAH), awarded them a contract to provide all of its 170 dealerships with online videos for vehicle inventory websites. SiSTeR Technology and Carfax announced that every active account dealer who has Video car Lot Advanced packaged and above will have the Carfax report rendered into the video Walk A-Round. more >>