We went from a 2010 Tundra to a 2012 Ram 2500 6.7 Cummins Crew cab. The Tundra towed fine but the big difference was in the mountains. We were white knuckled coming down the hills but with the Ram and the exhaust brake is so much better and we had more control.
DH took the 2012 took the Ram in for an oil change in 2014 and came home with a 2014 Ram 6.7 Cummins Mega Cab. He felt the Mega Cab would be more comfortable for our DD
and he liked all the new features especially the coil suspension of the new Ram. Made our cross country trips much more relaxing.
That was an expensive oil change. But the next few oil changes are free.