Heres an idea, but it's street tread rather than the NDT the millitary used.
http://www.rctruckandconstruction.co...ht=lego&page=2
Lego 62.4x20 tires, you'd have to make rims, but 2.456" tall .75 wide
Also may want to check out this M35A2 build
http://www.rctruckandconstruction.co...ad.php?t=10081