Thanks Paco.
I'm still unsure what I will run on my 2500HD Duramax as it will be needing tires sometime in the very near future. I'm still running the KO's (first version) on it but only have about 34k on them. I bought the 2006 Duramax in April 2009 (exactly 10 years ago now) with 58k miles on her and it's just ready to turn over 92k. My son put the KO2's on his 2500HD three years ago but only runs them on his summer wheels and is still running some Michelin A/T's on his stock wheels for the winter months. The KO2's seem to be wearing well thus far but it's a heavy truck as well so doubtful he will get much more than yours or mine.
My Jeep damn near doubled the miles out of the KO2's as my truck and it really isn't all that much lighter which is interesting. Where you don't have to deal with snow packed roads the mud-terrain tires look like they work out well but when I had the KM2's on my JKUR it couldn't get out of its own way if there was even a skiff of snow on the road. Stop at a light and it was quite common to have to shift it into 4-hi just to get moving then back into 2-hi.

As soon as I put the KO2's on it was instant gratification as far as highway driving and especially winter driving. I don't think I can remember one time in the past 4 years of having those tires that I had to use 4WD on the pavement. So far the Nitto Ridge Grapplers, in as much foul weather as we have had over the past several months, are performing in much the same manner as the KO2's. However, if truth be told I would say just an ever so slight edge would have to go to the KO2 in winter driving but only slight. I haven't had to use 4WD at all this winter with the Ridge Grapplers but on a couple occasions I slipped a tire pulling away from a stop, but that could be due to the more than double the HP I have available now, but that was even at very light throttle so hard to tell.
I may still go back to the KO2 on the Duramax just due to its proven track record to me unless something else jumps out at me between now and when I buy new tires for her.
That is very kind of you to assist your friends widow, I'm sure he is smiling down on that.
As for the front license plate on your son's Camaro, I get that it's the law (and a stupid one at that) but it sure throws off the nice lines of the car. At least you made a nice looking mount for it.