Scott,
Attached are some more images from the Design Record.
I do not know for certain, but I believe it is likely the the “distinct” tread designs from the various manufacturers were standard amongst the different tire sizes (Tony’s Firestone 9.00-13 tread appears the same as the Firestone 10.50-16 shown below).
While Sand Tread tires are mentioned in the design record, they receive little attention, are not detailed in the comparison charts, and there is only the attached image (in the Tire and Wheel Data section).
Charlie,
Attached is larger version of the previously posted chart which includes the 10.50-16 dimensions
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