Thanks for the help guys I was leaning towards the BFG's my brother runs em on his single wheel truck and he gets about 50k miles to a set but he's meticulous about keeping them rotated and proper air pressure in them which I know helps a lot.
I will have to check the date codes on my Hankooks. i like the ride and the low noise of the Dynapro's plus it's the inner tires that are splitting, but when I say splitting I mean two inch cracks every 4 inches around the side wall I might try to post some pics tomorrow, it's like they've been ran under inflated but I've always kept the pressure up on em