I have a Grabber AT spare 31X10.5. I've never used it (knock on wood), but it loooks like it would perform nicely offroad. The 31X10.5 runs a little short but they are WIDE on stock 15X7 rims. 30.5" X 10.4"..
So you wont gain the height (ground clearance) that you would from a BFG AT KO, but these are wider, so traction might be better. Why not go for the Grabber M/T? I hope this helped a little.
http://tyres1.com/search/products/0127046.html