Not all of the 2015-2020 lower trim Tahoes and Suburbans have the mounting bracket installed on the bumper cover to accommodate the cover, FYI. That's what I have noticed if I'm ever behind one that doesn't have the cover. There are none of those tabs along the top that the cover hangs off of. I also noticed a possibly 2015ish that seemed to have a slightly different design bumper cover. The little plastic cap that hides the spare tire lock/lowering slot seemed to look different than the styles that get somewhat covered by the hitch cover.
I have also seen Police variants that do not come with a hitch integrated in the bumper as well.