Don't know how the KM2 compares to my AT KO's in regards to sidewall, and I suspect you are more of a wheeler than I am, but last time out, running around 20PSI, I got a pointed rock into my wheel, ruining the trim ring and tearing a valve stem before the truck jerked free, but did no damage to the tire.
Same trip, on the freeway on the way home, at about 50 miles the steering felt funny (but not dangerous...just an occasional pull on the steering wheel). Knew I was starting to run low on pressure, drove about 10 more freeway miles at 55 to the exit, and parked it. When I finally stopped I had 5 PSI in the tire, and it was hot to the touch and smelled. But no major handling issues up to that point, and no visible damage to the tire, even though the bead wasn't seated evenly anymore. Aired it back up, bead evened out, drove it home.
Had the valve stem replaced at the tire store the next day. No comment on condition of the tire, other than it was almost 8 years old and should be replaced based on age. Since it's stored in the shade, there is no cracking of the tire, and IMO, other than a few scuffs from off-road, they look brand new still, to include the tread.
I notice no sway I would associate with thin/weak sidewalls when driving/cornering on the street, and on the first tire I put a nail through, it never did leak air...no idea how long it was there, just happened to notice it when I was under the truck.
As long as BFG puts the same construction principles into the KM2, I don't think you'll be disappointed.
