Not that this helps you about the Pros. I have the Toyo open country R/T Trail 37/12.50 R17 LT, E rated, not the Pros. They ride smoother and better than the stock C rated Falken A/T tires that came on my Mojave. Noise wise they are the same as the Falkens.
They are not the RT Pros, but they have done great normal driving, and great in the mud. I drive in muddy conditions constantly at work. The RT Pro’s should do even better in off-road conditions. I would have bought the RT Pros if they were available when I bought these. I have always had great results with Toyo tires.
I have to agree, that’s too heavy a tire, literally about 10 lbs each, plus sidewalls are tough, but will not deform off road for enhanced tread expansion when aired down.