Noticed Mopar now has the accessory kit to add the tailgate dampening to lower end trim levels. The picture looked just like the aftermarket struts that go between the tailgate and bed, but in reading the instructions this is quite different. I also assume this is how all trim levels handle the tailgate dampening. You have to remove the driver's side taillight and the strut goes inside of it connected to a lever which pivots as the tailgate moves.
https://moparonlineparts.com/1500-tailgate-damper-p-8850.html

https://moparonlineparts.com/1500-tailgate-damper-p-8850.html
