I was told that the factory trailer hitch has a different bumper than the non-hitch H3's. The trailer hitch is some 4 to 5" above a new Yukon, so it requires a drop receiver in most situations.
I would surmise the reason for putting it so high and into the bumper was so that the departure angle wouldn't be too adversely affected, but an H3 at my dealers test track did scrape the hitch a bit. My terminology of receiver and hitch may be off, but keep in mind that your H3 has a slightly better departure angle than hitched H3's.
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