Need new tires. Questions about upgrading..!

I love the Michelin LTX MS2s. I have load range E on my F250. Ride - excellent, tire wear - excellent, road noise - none. We had a lot of deep snow in Indiana this winter and I was pulling people out of ditches without a problem. I wouldn't do any serious off-roading with them but last fall when deer hunting I parked in a gravel area along the side of the road. When I returned to the truck a few hours later the truck had sunk 3" into the soft ground under the fresh gravel. With sufficient wheel speed to throw the mud out of the tread and driver ability I was able to get out. For your size rim a load range D may the be the max you can get.