Funny, on jeep's website in the build options it's called "Hinge-Gate Reinforcement by Mopar" ...It is a Mopar Swing Gate Reinforcement. No where does it say that it is a Swing Gate Hinge Reinforcement. This item was designed to reinforce the crappy metal that is used to skin the swing gate that an oversize tire may damage due to movement while under power, off-roading, and just plain old opening and closing of the swing gate.
Now is it worth it? I think so for that very reason. I don't want to have to worry about hanging a 37" tire with aftermarket rims on my tailgate and then having a warranty claim for damaged door skin be denied due to not upgrading to the kit and excessive weight on the gate. The only issue I have with the kit is that you have to buy the Oversize Spare Tire Carrier Modification Kit also. It should come as one seeing as how it it is required for both to be able to use one or the other. Just BS if you ask me.