I traded a 2013 Ram 1500 single cab, 5.7, 6 speed with 3.55, for a 2014 quad cab 5.7, 8 speed with 3.92 rear. The 6 speed just didn't seem to allow all the engine power, difficult to explain, but it just didn't feel it was there. The 8 speed, especially with the 3.92 is night and day. Much more power available any time I need it. An added bonus, it gets better fuel mileage also. Within it's capabilities, it will pull anything, anywhere with power to spare. I don't know if an Ecoboost 3.5 would satisfy more or not, but this is the absolute best half ton truck I've driven. You would do well to put it on your short list.
As others have mentioned, your trailer will be pulled better by a 250/2500, simply because everything is heavier, but that of course depends on the majority of use. My half ton is a daily driver 90% of the time so its pulling chores are less priority.