I've had six different sets of tires on my duramax and the LTX michelins are what wears the best, head and shoulders better than anything else
I'd try a toyo R/T or nitto Ridge though if you wanted something more aggressive. If I can't get somewhere in my 4x4 duramax with the michelins, I probably don't have any business going there in a 8000lb pickup to begin with.