I was just at the dealer today about my 285/75R/17 Toyo OC AT's. I have 18K miles and when new the tread was 17/32. It is now 6-7/32.
From my experience, there is a HUGE difference between the A/T and M/T Toyos. I'm on my 3rd set of Toyo M/Ts, and have run both 35x12. 50 and 37x13. 50s. On each set, I've got 40,000 - 45,000 miles with the truck set on 600 hp mode all the time. At least 60% of these miles have been pulling/hauling/working. A good portion of them have also been major offroading.
I've jumped the truck more than 4' in the air literally a hundred times at least, have been through river beds, extreme mud, rock crawling with a 9k lb truck aired down to 18 psi, broken through 8" of solid ice into 3' deep water, etc, etc, etc. I've had the rear axle weight at over 8,000 lbs on these tires, and they've never missed a beat. I've never had a flat, never blown one due to abuse, and they keep on going. These tires are balanced so well, that I don't even have them balanced on the wheel anymore. To me, a 37" mud tire that will handle 110 mph with no vibration unbalanced is exceptional!!!
I've tried ProComp X-terrain and Mud Terrain, BFT A/T and M/T, all with dissatisfaction. I ran a 285/75 Toyo A/T this summer to Alaska, and wore off 13/32 tread in 8k miles. For some reason, the A/Ts do not wear nearly as well as the M/T.
Well, that's my experience

Oh... and all of the Toyo M/Ts I've had have been made in Japan... probably not my first preference, but, after all, my truck was made in Mexico.
--Eric