Dodge cummins 5.9 or 6.7 ?

I have a 2014 2500 with the 68RFE and they do shift different than a gasser transmission, especially when not towing. Occasionally you can get a harsh shift, mostly if you quickly let off the throttle right when it wants to shift, but it is not bad. The annoying thing that it does is if you are running about 50 to 55 at about 1100rpm in 6th with no turbo boost, if you add throttle to accelerate, mine will down shift a gear or two, let the engine rev up and add boost (while not adding much acceleration), and then upshift back to 6th and then takeoff. With the 10K travel trailer or 14K equipment trailer behind it, the transmission actually seems happier and more relaxed. From looking at the forums, seems like most failures come from either abuse (hardcore mudding with giant tires) or on deleted and hot rodded trucks that are putting out a lot more than stock power.