Thanks, and good point on the 6-ply. I am running 6-ply now and I didn't notice any mileage impact at all from those.You will take a good MPG hit with the heavy Load Range E STT Pro but the Duratracs can be had in Load Range C which, to me, is they way to go if you daily drive it and you pretty much only do mud and little to no rock crawling.
LOL. I'm running some Cooper STT Maxx in 255//85/16 and they've been awesome but I'd like to drop down to some load range C tires but I've only got about 25K miles on the STTs and they still look like new. I'm one of those people who cannot bring himself to replace something that still has useful life. For that reason, I never worry about treadwear warranties and stuff like 100K mile sparkplugs - I always want to try something new way before they're ready to NEED replacing! WTH right? It's one of my hobbies as well as transport!
The Xterra isn't my daily - my 2019 Frontier SV 4x4 is my primary vehicle, so I'm not super concerned about tire noise, or mpg hit from a tire swap on the Xterra. However, I am leaning more towards the Duratrac's. I think they will probably handle and wear better in the mostly highway use my Xterra sees, but still give me much improved off-road performance over the current Cooper AT3's. I really wish I would have thought about this a year ago when I upped the Fronty to 265/75's I could have just put the AT3's from the X on the Fronty, and upgraded the X. oh well, lol.