I love the looks of the Mud Grapplers (even more than the Xterrains)... very Fred Flinstone, and I did not mean to dis all MT tires. I stand by my review of the Xterrains though. Aired down to 15-20 PSI, they provided nowhere near the grip of the ATs. I think the tread pattern has a lot to do with it. The Nittos tread overlaps, and if you have a MT with the same basic pattern of an AT... you are not constantly on the void half of the tire rather than the rubber half.
Not to dis MTs again, but (unless you are red-lining through swamps all the time) don't get these...