Hey there. Sierra owners. Today on your 2019 GMC Sierra, we're going to bring you some real mountain synergy when we test fit the RockyMounts WestSlope. The WestSlope is a two bike platform style rack with a gradual slope to it here at the back, which is great because it's going to give you plenty of ground clearance at the rear of your Sierra. Like most platform style racks, secures your tires in… see more >