I sorta did the same thing....I had a 2005 Ram Cummins that I bought new and traded for a gasser after a few years. The Cummins was super wonderful, and we pulled a big 5th wheel all over. We parked the RV and didn't need the diesel so I went to a half ton Ram Hemi. The change was a good one....a lot less maintenance and fuel was cheaper and it rode a lot smoother. I no longer needed the power of the diesel.
Well, wifey talked me into a new 5th wheel, and at 8,000+ pounds I was not comfortable towing with a 1/2 ton. So, we bought a new Ram 2500 and I opted for the 6.4 with 373 gears since the RV was smaller. I did think about another diesel but decided the 6.4 Hemi was enough engine for what I needed.
It turned out to be a good choice for me. I have the ease of a gas motor with less maintenance and no DEF stuff. It rides better than the old Cummins with the coil rear springs (though certainly not as smooth as the 1/2 ton), its easier to drive as a daily driver, and it pulls the RV very well. Most places we go are fairly flat so it rides pretty happily in 5th gear most of the time when towing....4th on occasion but almost never into 3rd. MPG runs between 7 and 10+ depending on speed, terrain and head winds, just like any other rig.
Overall, I am happy with the truck...I bought a Tradesman so it doesn't have all the bells and whistles, but I added a Sony radio with a backup camera and bluetooth. It's a pretty good looking and pretty comfortable truck and I am happy with it.
I drove a F250 and a GMC 3/4 ton and, while very decent, I just liked the Ram better. The GMC's ride was much more harsh and the F250's towing mirrors were not to my liking, and both trucks seemed to have significantly less power.
