I installed Monroe Reflex rear shocks on my truck. They are a monotube. I would put these in the middle of very soft factory 2wd shocks and Bilstein 5100's. Ride is more controlled but still have the softer ride on small and big stuff. Bilsteins were stiff on small bumps but good on big hits.
Well when other leaf spring manure carrying trucks are riding better with the same payload capacities people tend to think there may be something that was done wrong or perhaps they can fix it.
According to some post of Facebook the 2018 rear shocks are the same length as the 2019's. So any Bilstein or Eibach for the 2018 should be good to go.
Two issues for me. About three weeks ago I had a check engine light. I brought it to the dealer and it was a knock sensor. It was cleared and did not come back. This past weekend I was driving and the check engine light came on along with a message on the screen saying engine power reduced. Felt under-powered and felt like it wanted to stall from a stop with slow acceleration. Brought it to the dealer and it was the cam position sensor. 3000 miles. Starting off great haha.