I saw a set of these end their life when two of them (on the rear) totally split the side walls on a off-road trip. This came near stranding the vehicle but we were able to salvage a spare off of another Ranger to get it to a shop for new tires. I don't know what all these tires experienced during their lifetime but were said to have always been aired properly. They had been aired down while off-road. They were not worn out but were getting on the low side of thread depth.
It was the only vehicle out of eight that had tire problems on this trip.
I was on the same trip as Gary and I can confirm this.
If you go back to the first page of this thread, you'll see that one of the posters singing the praises of the Dynapro was MJMcdowell - well, that's Michael and he is the one who had the two catastrophic failures within a 4 day period on our trip, so I'm guessing he probably wouldn't be as enthusiastic about them now as he was then.
The troubling part was not that the tires failed, tires fail all the time. It's that in both cases, we were driving on mild dirt roads (not even particularly rocky ones) at moderate speeds and without warning, the tire completely came apart at the sidewall. In both cases the sidewall was completely destroyed by the time Michael brought his truck to a halt.
I had Dynapros on my '99 4runner for our Moab trip and they did just fine. They also did great in the snow in Colorado.
But my observation after our Nevada trip is that they have an extremely vulnerable sidewall, so if you do a lot of desert running, this is something to consider. I had been thinking of going to Dynapros for my current 4runner, but after our experiences in Nevada, I will stick to the tried-and-true BFG AT or MT.
Yes, they're pricey when compared to the Hankooks, but ask Michael what it cost him to lose two tires on a desert trip, not only in terms of money but in terms of time and hassle.
Sometimes going "cheap" now just means you'll be paying later.