...And in terms of the Frontrunner Slimline II rack...great rack, but it can be noisy. I have the 40" Frontrunner light bar on mine and had to have a custom bracket fabricated so it could fit almost below the rack - minimizing the gap between the roof and the rack. The curve of the roof line on the GX impedes using the supplied Frontrunner brackets. Once I added that, and used rubber door guard on the cooling fins - no more noise.
