I got rid of my KO2's C rated. Hard to balance, wore out at 39000 miles, and loud as they wore. Did have a nail in one tire as well, on the sidewall which Discount Tire wouldn't fix.
Right now I have Hankook Dynapro AT2 RF11's in 285/70R17 E rated. RF11 is a new version in 2020 with better traction advertised. I was worried about E but turns out not a problem with ride quality. Reasonable price, smoothest AT I have ever owned, very quiet, and snow and wet traction is supurb. Not as aggressive looking at the KO2 but I don't care in the least, the ride comfort is most important. Gas mileage is about the same even though they are heavier than the C load KO2s. I think the biggest hit to my MPG is my lift, wind resistance.