Hey folks! I found this thread a few months ago when I was searching for information about the Les Schwab/Mazama tires. I bought a set in January of 2019 specifically for a trip from western WA to Wisconsin - IN THE WINTER! (...nobody ever said I was the sharpest tool in the box...).
Well, now that I have firsthand experience with them (about 5000 miles now), I have to say that I really like them - a lot!. The 2000 mile trip from WA to WI saw 1500 miles in snowy conditions. My F-150 performed incredibly well in large part to the tires. While I-94/I-90 had the right lane fairly well clear, the norm was you had to venture into that uncleared left lane if you wanted to pass. The mountain passes weren't always plowed either. With the truck in automatic 4wd I passed confidently (at 60+ MPH) and only once did I feel the truck slip. That one slip was going up into a pass in Idaho where the roads were in horrible condition - I press on the gas, the truck downshifted and when the turbos spooled up it broke traction for just a second before the computer dealt with it. I honestly don't think I could say that with the OEM Hankook tires.
Other observations; recommended tire pressure is 51psi - that makes for a bit more harsh ride, driving over road imperfections seem a bit quieter, I haven't spun the rear tires on wet roads when starting from a dead stop.
Bottom line - I'm very happy with the Open Range A/T's. Size is 275/55R-20 which calculates out to 31.9" high, 10.8" wide.