Side rails, front brush guards, etc., are all installed by the dealer; even if ordered with the vehicle.
nmikes is correct about the hitch, the factory hitch is installed at the plant, due to the difference in the bumpers. Factory hitch has a cutout for the hitch, while the non-factory installed hitch bumper has no such cutout.
There have been a few that have had an aftermarket hitch intalled. A search for hitch might bring up some hits.
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Black Sheep Hummer Squadron
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