If you don’t plan on removing the emissions I would look at the 2014 up trucks. But if you are going to remove the emissions I would be scared to look at the 2010-2012 trucks. But I would try and find one that is still all stock and delete it your self. You never know with one deleted how the owner treated it. I have a 2010 ram 2500 that’s had all the stuff done to it. With a 80HP tow tune I averaged 24MG driving 70 mph to gulf port Mississippi. But I Daly drive it on my 500 HP race tune. I love my truck but the 2014 have a lot better looking insides and are soposed to ride nicer with the rear coil springs. Oops also forgot to add mine has the 68RFE 6 speed auto. Happy hunting on a newer truck