Thule roof rack on 320 boondock/outback edition

Looked through the owners manuals and could not locate any specs.....   Is there a load rating/weight limit anywhere?     They have removed the basket and spare tire and was thinking it would be slick to add a cargo carrier.    

Has anyone done it and what were the result?    I wonder how much it impacts the air flow over the trailer.
2009 GMC Canyon,   3.7 liter 
2020 320s Boondock lite, With Lots of mods

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