My 2017 Ram truck came with those Nexan tires and I actually thought they were pretty good. We did quite a bit of dirt roads in Alaska with a heavy camper. No funny wear or flats. They only went about 25,000 miles but I have never had much better with a dually and heavy camper.
I have always run at 80 psi with the camper and 65 empty. Airing down to 65 (door psi) leaves the tires a little closer than I like at the ground. Aside from harshness of ride are there any generally accepted reasons to air them less than the tires max rating?