Firestone Super Rock Grip 12 ply for $50 each. I couldn't find data on this pattern and size for load capacity or speed rating. They aren't chevron tread but do have a lugged treas as opposed to highway tread.
http://store.colemans.com/cart/750-x...res-p-168.html
Another lugged 12 ply in 7.50-10 (but this one looks more fork lift)
http://www.profipneu.ch/default.aspx...9BD30B02F#tech
There is a load capacity given for the 12 ply rated tire but since there is no speed data given I would assume that the rating is only valid for low speeds.
http://www.titantirestore.com/store/deeptrac.html
A 2005 military tire catalog found online.
https://www.themotorpool.org/TireCat...%20Updated.pdf