Thai, I just finished my second summer with Dueler H/T tires on my 4th Gen.
I was apprehensive when I got them as take-offs from my friend's new TRD Off-Road 4R, but they earned their trail cred with me.
I drive 10-12 trails per summer in CO. Nothing crazy, roads like Hagerman Pass, Mosquito Pass, June Creek, Argentine Pass, Old Tennessee road, and so on. I'm not into rock crawling, just scenic discovery drives.
None of the trails left me wishing I had more tire. I keep them around 32-34 pounds, never once aired down, and to say that I'm impressed is an understatement. For a tire that looks like a highway Michelin and that's available dirt cheap on craigslist, they do an incredible job on the roads I took them to. My first drive on the Duelers was a snowy road with a drift obstacle that stopped a Land Cruiser and a Taco. The 4R drove right over the drift when I was sure that I'd have to have those guys tow me out.
I now have about 20 thousand miles on them and they still look brand new with no noticeable tread wear and literally zero chunking.