I would agree with the comments on skipping out on the Michelin AT if you do any off road driving. The Defender Ltx is a great highway M&S rated tire if you want to stick with Michelin.
I would disagree that the K02 is the best all terrain on the market. They are good but in my opinion and that of many of my customers the General Grabber Atx is just as good with slightly longer tread life and a significantly cheaper price.
I have the Michelin LTX MS2's on my 2002 and they have 71k on them. Rotate very 6k miles and they are just about to the wear bars. Nice and quiet and load range E. Ride isn't that bad but then it is a 2002 Silverado 4x4. Love the tires. Put a set on our Suburban and they did well in the PA snow this past Dec visiting my mom.
I had a set of the Michelin LTX m/s on a regular cab long bed Chevy truck. While they were great on road they were very disappointing on wet grass. If there was a dew on the ground I would need to run in 4x4 coming out of hay fields with a steep incline.
Maybe the new Defenders are improved in that area.