So my curiosity was getting the better of me, so I ran out and swapped tires. In taking off the drivers side, I noticed it was shot too (belt showing). Geez why the hell didn't I even look at it when I found the other one????
So, off to the tire shop again. But... I suppose the broken belt on one side could have been jumping up and down enough to cause the other side to go bad if I drove on it enough (have no idea, the suspension is a bit rough to begin with).
Guess I'll see if it smooths out with some more new rubber