If you want to upgrade from a 5” to an 8.4” screen, there are a couple of things to consider, do you want nav? Or no nav. There is the uconnect 4 format, this is only for 19-21 models, it’s possible to upgrade to uconnect 5, but you will have to get all the parts for it, because a uconnect 4 screen will not work with a uconnect 5 radio module, but take it it one step at a time. I currently am running the 8.4” uconnect 4 system, I was very fortunate to find the whole setup with the bezel and the module. You should not have any issues finding a full setup. So your concerned about dual climate zone auto climate, I bought a setup with the dual zone hvac controls, I am running my setup with single zone auto climate, in order to get this to work I had to buy the auto climate harness and the sensors, you can get that on Infotainment. Com, if and when you do get this, programming is not that hard. I learned how to do everything from this forum. Also type in jimmy 07, he is very knowledgeable about the 5th gen Rams, if you need help with part#’s let me know