I have never owned Duratracs, but have owned 3 vehicles with BFG A/T's (A 2005 H2 SUT, a 1996 2DR Tahoe, and my current 2007 H3)
The set on the H2 lasted 60k, before the vehicle was totaled. They had 40% tread left. The Tahoe's were beat when I got them. My current tires have 20k miles on them, and at this rate will last another 60k. My mother's expedition has 80k miles on the BFG A/T's. Still great tread remaining.
I have driven in all possible on-road weather and in all types of off-road terrain and have yet to be let down by the BFG A/T. Quiet, good gas mileage, good traction in all conditions, long lasting. Just keep them properly inflated and rotate them. For reference, I have also owned (at least as far as light truck tires are concerned) Interco TSL Radials, KM2's, BFG Long trail T/A's, Dayton Timberline A/T, BFG KM1's (or whatever the first gen was called), Bridgestone Duelers
Just my .02