I guess I don't know what there is about Michelin tires on your E450 motorhome that should be considered as "overkill".
Michelin tires have been installed by Ford, stock, onto Ford E350 and E450 cutaway van chassis as delivered for years to U.S. Class C motorhome builders. I consider Michelin tires as about the best available for a Class C motorhome. However, some folks might discuss a couple of different types of Michelin tires for Class C motorhomes with respect to one Michelin type of tire being "better" than the other.
We are on our second set of Michelins with our E450 24 foot Class C motorhome. Our current set carry a 70,000 mile tread warranty and are Green X rated. The last thing we want is a tire problem out in the middle of nowhere when drycamping in our Class C.