fyi toyo tires are built by the same plant /manufacturer as nitto tires. exactly the same rubber etc. toyo m55 are about the best gravel tire going, i've tried almost every tire out there running survey crews. not much will hold up in the alberta oil roads. as far as i've seen.
Toyo MT's are crap, not all toyos, but they are all overpriced. I've ran m55's and toyo AT's to and like them but would never dream of buying a set new.
Ya nitto is owned by toyo or whatever but it doesn't mean much the tires are completely different.