Originally Posted by Rpracing1:
In my 35 plus years of spectating sprint car races, 25 plus races a year in the midwest, I think I can count on one hand the number of RR axle failures that I have seen. Is this a bigger problem elsewhere in the country? Or is my mind just gone? 
I've seen it several times, usually as a result of a rough track (I think Holtgraver did it in October at Atomic driving across the ruts). But You're right, you don't see it everyday.