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My Nitto Dura Grappler mini review, after 40k miles.
F-350 Crew KR dually diesel weighing 7990 lb. empty (no driver, half tank of fuel). Tires NEVER rotated. (Wearing pretty evenly.)
I finally clocked 40,000 miles on my Dura Grapplers. Tread depth started at .5" and are now at .3" (give or take .025") per tire.
I have towed heavy trailers and loaded the bed with up to 4500 lb of dirt and gravel, as well as 3000 lb of wood and other materials. I'd say about 20% of the life of these tires has been under heavy load, as I don't tow daily.
100% of the tire life has been in mountainous terrain, driving mostly winding roads up to 60 mph (slower on the hairpin turns). Additionally, I've driven under all conditions (snow/ice, rain, dry, dirt, even through a small river occasionally).
They do very well in all conditions, but now that they've worn in, they do slip a bit on ice. In 4WD, no problems at all. I have to admit my limited slip in the rear end is not working, so 2WD is really 1 wheel at this point. (Will be fixed when I service the diff. this month.)
The only tire I have to compare is the stock BFG Rugged Trail, and it was almost a slick at 60,000 miles driving on flat land in Florida. (Hometown is Tampa, FL.)
So far, this tire is performing better than expected, having lost about half of its tread depth in 40,000 miles, and not being rotated at all. At this rate, and driving the same way, I should get 80,000 miles before I get new ones. I highly recommend this tire.
Vermillion Red/Tan 2005 Ford F350 DRW King Ranch FX4 (bone stock).