2018 Coronado Engine

I'm curious to hear what drivers experiences are with the 2018 Coronado (mid-roof, 13spd, 3.42 rears) specifically between having a DD15/16 or X15. Looking into a new truck at the end of this year or beginning of next year. So if you could throw your 2 cents at me, average fuel economy, regular maintenance, frequent issues that pop up and any general quirks. Just a note, I pull open decks usually stay under a lowpro step or a double drop, what evers on might be 4' tall, might be 14'6" (total height), and anywhere from 11k# to 60k#. Know there are a ton of variables but I'm looking to get a better idea of their performance.