What is best tires for e 450 super duty

I have a 2000 28.5 foot Coachmen C on a E450 chassis. We put Michelin XPS Ribs on the unit several years ago. We are now at about 35,000 miles on them without a single issue. Not even a flat. That includes 2 times to Alaska and back at 10,000 miles each trip. The tread looks nearly new even at that mileage. The only down side is that they give a slightly harsher ride due to the all steel construction. But the security and safety of the steel construction is what I wanted for the rough back roads. When it is time to replace them I will likely go down to the Michelin LTX since it will likely not make the Alaska trip again.

Mike