Dometic seems to be going down the RV supplier / vendor road laid out by LCI fast. Posts about Dometic AC units crapping the bed prematurely are easy to find in every RV related forum, and have been for a couple of years.
I have always had good luck with Coleman Mach. The 15K Coleman unit on our 2017 Rockwood has made it two years and blows really cold, its also fairly quiet. We're not running it here in PA like it would be running in TX however.
Too many geezers, self appointed moderators, experts, and disappearing posts for me. Enjoy. How many times can the same thing be rehashed over and over?