Attention, the instructions do not indicate the presence of the front and rear bars. The shorter beam goes forward. I installed them in reverse order. No problem, I thought, I'll take it. Unfortunately, 6 of the 8 mounting screws were broken off, so I had to drill through them and use a screw extractor. Lesson learned. Other reviewers mention the screw. If you never touch the rack after the first installation, you'll love it. If for some reason you want to move it, you could get into big trouble. Our 2015 Denali has two rear mounting positions and I'm not sure which ones we'll be using. I need to move it so I reconfigured it and bought the original rails from GMC.
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