One of the benefits of going with a higher load range tire, as I understand it, is the higher air pressure allows for more heat which allows for higher speeds. C rated tires are 65mph max. I would imagine some tow at speeds higher than that? I do.

This is the MC thread I learned about the Kumho tires. Post #147 page 15 states the tire has a Q speed rating = 99 mph.
http://www.mastercraft.com/teamtalk/...=32154&page=15
I like that it gives you a higher safety factor. Over the top? Maybe?