Today on our 2007 GMC Yukon XL we're going to be doing a test fit of the SportRack Horizon rooftop-mounted cargo box. This is going to be part number SR7017. If you look up here you're going to see that we already have three of our feet in place, both the front ones and one of the rear ones. We're going to show you how to place on that last foot and leg today. This box does only favor one side and… see more >