Today on our 2013 GMC Yukon, we'll be test fitting the Thule Force XXL rooftop cargo box, measuring 21 cubic feet, in AeroSkin black, part number TH626. With the factory roof rack system onto our Yukon, we'll begin our test fit by placing our Thule Force directly onto our crossbars. As we place it on, we want to make sure that the feet hanging out of the bottom of the box go around each crossbar.… see more >