They may be too big for your truck, but surplus military Gama Goat tires are available. The 'Goat uses 11.00-18 NDT (military lug) 6 ply tires. Try Jack Tomlin in Tooele, Utah at 435-882-0420 or Larry Johnson in Ogden, UT at (801)731-1120. Last I knew they had a large quantity of them from $65 to $90 each.
