I drove on a flat BF mud terrain which is a load C but supposed to be strong as shit. Tire guys looked at it and it was toast. I did less than 5 miles. But it was also FLAT flat. Zero psi.
Dust on the right is rubber being chewed up.
Here's the metal I picked up.
Bottom line: I wouldn't chance it. Sucks, but not worth the risk. If you don't already have a full sized spare, get 2 new ones for that axle and mount the remaining good tire on the spare rim. Then you have a good full size spare also. And keeps tire rotations a little more easy to follow.