I have a 1999 4WD Automatic Std cab (2500) with only 104K on the odometer. I just had the third (counting factory) set of rotors and calipers installed. I got 74K out of the factory set and only 30K out of the second set. The brake shop tells me this is not unusual! I say BS!!! I occasionally tow an 18' bass boat (no trailer brakes) but do not jackrabbit and brake hard. Still have the original shoes on the rear. Two questions: 1-is this real common and 2-are there aftermarket rotors available that will have more than . 030 "meat" on them?