My Ram DRW came with the Nexen tires and my personal experiance is they are garbage. 30K Kms or 19k miles the tires are worn out. Over 50% of the the miles was hauling 13000pd 5th wheel, mostly pave Hwy but some city and dirt.
I too am searching now for replacement tires. Michelin MS2 is/was the first thought based on experiance with them on my 2011. I had 30K miles on them and they were right around half warn which for some reason based on reviews claiming 100K miles I had in my mind half worn at 30K was below expectations. The price quote installed and balanced for 6 is $2190cdn which got me looking more.
Friend who has a 2011 version of my truck delivered campers for a few years. He is running Firestone Transforce HT tires and swears by them. Quote I got for 6 installed was $1432cdn. If anyone else has experiance with these please let me know.
After reading some of the post here will check out cooper and hankook. Had a set of Hankook tires on my car a few years back and liked them.
2015 Sandpiper 30IOK
2014 Ram 6.7 CC DRW
2006 Charger RT