my personal experience is :
i have owned my current hd 2500 duramax /allison since i bought it new in 2002.
because it has so much reserve capacity i have not needed to upgrade it .
i tow a 21T komfort trailer wit a gvw of 7200 # on the axles and 1000 # tongue weight with 50 gallons of fresh water in the nose .
i was buying a new 8 lug suburban / pickup about every 5 years since 1972. i bought the largest big block available without exception for 7 pickups . mostly 402, 454 , a 460 .
the duramax has been totally free of any problems including that it has not needed new injectors as rumoured to be an issue with the early duramax .
it still has the original humongous disk brakes front and rear that it came with.
because this pickup has so much reserve capacity built into it over a 1500 pickup i have not found an excuse to buy a new one .
i have been a fast driver all of my life . the first 8 years i owned this pickup i towed my TT and my boat well over the posted limit .
$ 4.12 diesel has cured that . i do not want 765 foot pounds of torque . i know myself .
i have many camping friends that we do dispersed camping and FS , NPS, and BLM camping with .
we have all gone to diesel hd 2500's , f250's, 1 cummins .
the diesel pickups have a service life twice the life of the 1500's in our collective experience if used 15 -30% towing and the rest as daily drivers.
2 have gone 250,000 miles before selling and replacing with a new diesel .
i have a 1400 sq. foot attached garage so my 11 year old truck looks cosmetically good .
if you have to park outside then maybe you want a disposable 1500 pickup .
just some factors to consider .