New owner informed me a belt was bulging out, when he aired them up to 65 psi (I always ran them at 35 psi). Turned out to be a broken belt. 3 of the four were dry cracked around the rim - probably due to sitting as much as much as my truck does. I gave the guy his money back.
Long story short, Mastercraft gave me a full warranty on all four tires, so the tires are now brand new.
They're unmounted, so if someone wanted just tires or just wheels, we can work this out.
Same Courser AXT load range E -285/75R16 tires and 16x10 rims.
I'll update the craigslist ad soon and will plan to post here.