Well after seven years and 8-10K miles it's time for some new shoes. It came with Duro HF 502 bias eight plys, and since I couldn't find too many bad reviews (At least not when compared to other makes.) I decided to stick with Duro. But I did upgrade to DS 2100 radials, so we'll see how they are when they get here.
Once they get a few miles on them I'll come back and write a review.