I signed up to first say thank you for this thread.
Second, I put 285/75/18 KO3s on my wife's OT+ today. As noted, the "crash bars" (useless metal brackets) needed to be removed. No rubbing at full lock. Looks 10x better than the comparatively wimpy stock tires.
Ride is sound and it absorbs bumps a little better given more rubber. I get that they are E-rated (stiff) but I'm not upset about how it drives. I may go lower on the tire pressure to soften it more, since I don't plan on towing anytime soon.