I have owned about 8 dodge trucks over the past few yrs, all 2500's however(currently a 2016 2500 diesel)
but several friends have the 1500;s from about 2004-2016's
and I have drove them all, the new 8 speed trans in the 1500's is the best thing they added in yrs, I would NOT do a 6 cylinder, and my reason is this, the hemi's are getting 18-22+ mpg pending HOW you drive them, a 6 will NOT do much better, due to weight of truck alone and HP to LB ratio's, the re sale value will be better on the Hemi as well, as , just more folks would rather a V8 over a 6 cylinder, 9 out of 10 times!
BUT like all gas motored trucks, as soon as you hook up a trailer them MPG"S drop
towed a 2016 hemi(don't know diff ratio, big horn crew cab short bed packaged deal) 500 miles with 2 atv's on a open place 8.5x10 aluminum trailer, LOTS of up and down hills every 10 miles or so, and averaged 10 mpg, about HALF what it got without the trailer, it ran great nice and smooth, no HUGE down shifts as in the past to keep speeds up, but it drops MPG"S pretty good when towing,
IF you ONLY tow once in a while, I would say who cares, and go that route
I'd however be looking at a new Ford too, with there new 10 speed trans and all aluminum body's, if you are planning LONG term ownership
I am NOT a Ford guy, but these more speed trans, just help keep things from surges(AKA suck that gas down poor MPG's)
an all aluminum body, prevents the better issue we have here which is body rot from all the road salt and chemicals they spray to stop ice on road ways, its HARD to get more than 10 yrs out of a body here due to it, that aluminum should solve that part of things??