I'm a poster-child for US domestic off-highway, from the beaches of Florida to the Cœur d'Alene Mountains, deserts, plains and mountains in-between.
I've gone through a set of MTR/K's and Duratrac's. The MTR/K's lasted 43k and the Duratrac's 39k.
The MTR/K's were horrible in packed snow/ice compared to the duratrac's but felt more solid on the road due to the thick sidewalls. I would end up sideways often with the MTR/K's as opposed to driving on rails with the Duratrac's in the winter.
THE MTR/K's took 10 times the amount to balance them. The Duratrac's took less than my mom's tercel donut wheels.
The Duratrac is far superior for lateral traction than the MTR/K by far and large. Slippery sections on the Duratrac's give me more confidence than the same section in wet with the butt clenching MTR/K's.
If I lived more south, I would have chosen the MTR/K's when my last set of Duratrac's wore out but I went again with Duratrac's because we get some copious amounts of rain/snow in the pacific northwest.
If you are mainly in a dry environment, you will enjoy the MTR/K's.
If you are in a mixed environment with rain/snow,etc.. you will benefit from the Duratrac's.
I am running these tires on a Nissan Patrol which is a large SUV comparable to an 80/100 for size and weight so I'm in the same category as you.
You'll always get mixed reviews on any tire. Love/hate for any one.
One thing that no one mentioned is the technology advancements of tires in general these days compared to a decade ago and prior.
The KM2, MTR/K and Duratrac's all three have far better compound/design to cope with our driving environments than a single tire used to back in the 'day'.
You can't go wrong with either one.