Today on our 2012 GMC Terrain we're going to be test fitting the RockyMounts Roof Rack System, consisting of part numbers RKY3054, those are the RockyMounts Ouray Crossbars, and part number RKY3002, those are the RockyMounts Flagstaff Towers. Those are what actually wrap around your factory raised side rails. We already have the front installed. As you can see with the aero crossbars here, they're… see more >