Not to jinx you, but what about the spare?
I'm gambling on that one. It has about 300 miles on it. Spangler to Geeks then home. It appears to be in good shape as it is not in the sun or on the ground. So here's to my good luck.
4 tires was enough squish to send a kid to the oral surgeon and still get a refund from the oral surgeon. 
Mine is the same one that came with the coach. Still looks good and I know that is lame. May have to update that one sometime.