Questions about a 2012 Dodge 2500HD / Cummins

I had an 06 5.9 but had too many trans problems. I ended up with a 14 2500. I like that there were improvements to the rear suspension and the front end, that the 13 did not have. I bought one of those lease 14s, it had 17K miles on it. I hope the trans holds up, it is supposed to have a better trans cooler. I ordered all the parts for the 5er hitch to put on the frame and bed to use my old Pull Rite auto slider, just have to put them in. Love the truck, those cooled (ventilated) seats are super.