Each year added little nice "things". Like the 2016 got front park sense sensors and ability to move camera's between displays etc. 15's have things that the 13 and 14 do not.
SNOKING
The 2013 Ram 2500 does not have the 50k lbs/sq inch frame.
However, the stronger frame made oil (filter) changes a bit more inconvenient. I like how easy it is to access my oil filter (on my 2013). Also, the 13 & 14 have dual radiators. The 2013 still has a stronger frame than the 6.0.
Edit: the earlier model 4th gens had 35k lbs/ sq in frames. The upgraded 4th gen has 50k lb/sq in frames and are "boxed" a bit better (stronger)
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