I'm also a huge fan of Toyo tires, ran 6 sets of the 35" MT's on 2 Superduty's and an Excursion. My next set was going to be the Toyo RT's. Then I sold the F350 and moved up to the F450.
That's where my love of Toyo's ended.
Having moved up to the 19.5 Alcoa wheels that come stock the 2015 and up F450's, my tires choices became rather limited. The stock Continental HSR's with only 10k miles on them were smooth and quiet, but lacked any kind of traction on anything but bone dry pavement.
Being a Toyo fan, I opted for the Toyo M608z on all 6 tires. BIG MISTAKE! Truck was almost dangerous to drive. Even the tire shop manager noted that it was diffuclt to keep the truck in it's lane. Horrible bouncing, shaking at all speeds, serious tire squirm and extremely loud. ( remember I'm used to Toyo MT's)
After 4 attempts at rebalancing, replacing two of the new tires, having to buy two new wheels after destroying the front wheels, the tire shop manager conferred with his corporate headquarters, and decided the best bet was to switch to Michelin XDS2's.
Man...it's like night and day.
Truck rides smooth again, easily half the noise of the Toyo's, almost no tread squirm, and better traction to boot.
So...while I'm still a huge fan of the Toyo MT and RT...once you hit the commercial truck tire sizes, pay the upcharge and stick with Michelin. Lesson learned. Hope this can save someone else the 2 months of irritation I just went through.