Southest US Thumper
You may want to try the Perelli MT43 (DOT trials tire), I was surprised how well it held up to all the lava/cinder/asphalt. I had about 2,100 miles on it when I started my Big Island ride and when I was pau it had about 2,900 miles and about 1/8" center tread left with no missing lugs. It made it through South Point, Road to the Sea, Mana Road and the other road above Mana without any problems. BTW, I had it on a WR290R.