The tow package rear cover is not the same as the standard SRT rear cover. The one with the SRT impression bows out further to clear the receiver on the tow hitch. It can still be used as the spring clip spacing is the same and the one I received did not come with those spring clips, so I had to push out the ones on the original for use on the new hitch cover.
My SRT is a 2013 and the trailer wiring harness was already on the Jeep and is secured up behind the rear bumper cover. I did install the the tow hitch and it is a PITA because the entire rear valance needs to be removed for the hitch installation. You have to take the rear bumper cover off so you can remove the standard rear bumper support that is bolted inside the frame rails.
The hitch replaces that brace and it does have some heavy duty construction. The rear bumper brace has two bolts on either side holding it in place and the tow hitch uses three bolts per side to secure it in place. Both the hitch and the rear bumper brace have nuts welded to them and the bolts go through the frame rails into these weld nuts. If installing a hitch, you also will need to get the pig tail that plugs into the factory harness and gives you both the four and seven pin connectors.