So, The HUMMER rails can hold 250lbs (according to the manual) and the rack with the sunroof opening weighs 88lbs. Therfore, slopes and cornering aside, I would be able to load 162lbs on the rack without damaging the rails on the truck. By the look of the rack, I'm sure it would hold much more weight, but the top of the truck won't. Thanks for the input.
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