I have AT3W Wildpeaks 285/70-17 P rated tires and really like the performance on and off road. I’m like you, daily driver, 95% on road, 5% off per year. Smooth ride. I had E rated KO2’s in a 275 prior and they were a little rough. A C in the tire of your choice would be the highest load rated tire I would get for your needs.
Remember to check tire weight also.

I don’t think you can go wrong with the AT3W Wildpeaks, Cooper AT3s or BFG KO2. With the Wildpeaks and Cooper you get more bang and tread for the money but with the KO2s you get a little bit more of a quieter ride.

As for P or C tires, P tires may be more of a bargain price wise and you may get better gas mileage than C but off road they can be a little more risky than C tires. If you’re going to travel primarily on dirt roads or short distance on a trail a P may be fine as long as you carry a spare but if you want to travel further off trail or want more of a piece of mind traveling off road go for the C tires.

I spend about 85-90% on the road, off-road most on dirt roads when going camping but a few times I suddenly found myself in rough rocky terrain. My BFG KO2s got me through with no problems. My point here is when driving off road even on a maintained dirt road you never know what you might run into.

I'm leaning toward the Mickey Baja Boss in 265, can anyone compare them to the KO2?

Yup but surely not me. I have done Fins and Things, Elephant Hill, Kamikaze, among others, and the Maze on P-metric Wildpeaks. I have done 1,200 dirt miles in Montana including dozens of miles over sticks and tree branches, no issues. All the Sedona trails. No issues.

But there are 2 massive problems I had with my total 7 Wildpeak tires:
1/ Their good thread only lasted 10,000 miles at most
2/ They pop like popcorn in the SW parts of Arizona.

In fact, longevity was so bad, I had broken it down here before:

Up to 5,000 miles "best tire ever"
5 to 10,000 miles: "great tire"

10-15,000 miles "oh, really?"
15,000 miles+: searching for replacement.

So I had it with Wildpeaks when the experience repeated.

I am finishing my Baja ATZ P3 now at 34,000 miles and still usable on and offroad. They will make it to spring next year and 40k, as per warranty. Never had an AT before that lasted so well, since 2010.

I am looking at the Baja Boss AT as the obvious replacement though looks like the tread may be a bit different.

I have had LTD Ko2 and LTE ATZ P3 but on different vehicles. What I can tell is that the Mickey Thompson Baja were far better than Ko2 in rain and that I never had issues with them offroad. The Ko2 is not at all for any mud and generally it really does well in the desert around here and not much else. And even in the desert, the big flat tread blocks of the ATZ P3 are an advantage as it does not sink as much.

I hope the Baja Boss did not reduce the size of treadblocks much but either way, I don't really have an alternative that I like unless Cooper comes up with a Maxx update in 255 80 17. The Maxx is the sibling of the ATZ P3 but was not updated when the latter was replaced by the Baja Boss.

All that said, the KO2 do have qualities over most other AT tires worth pointing out. While I have defended the Falken over KO2 in the past, you get much more even quality with KO2, and you get puncture resistance that is only really matched by the Baja Boss/Cooper Maxx. In addition, the KO2 can last forever (which is also a downside because it is harder so less traction),

Thanks for the reply. I've started hearing about tread life with the Wildpeaks, especially P metric Wildpeaks, so I'll see how it goes for me. I'll be hounding them about paying out on that 55,000 mile (presumably prorated) treadwear guarantee/warranty if I don't manage to get at least 30,000 miles out of them.

For my first set, I wanted the comfiest yet best performing stock size all terrain I could find, and I ended up P metric Wildpeak AT3W with that criteria. Depending on how this first set goes, we'll see how I feel about upsizing, LT C's, LT E's etc a couple years in the future. I would say these things drive no worse on pavement than the Dunlop AT-20 Grandtreks the truck came on, and I appreciate that. I still don't like that LT C 265 KO2s have a lower load index than the factory tires, but they're LT's so they're not hit by that 10% load penalty that using P metrics in an SUV/truck application apparently carries, so they probably work out equal or on top. I don't think I've heard of people popping LT C KO2s on 5th gens over load index reasons.