I asked Ken the exact same thing in a PM and he said the type of rock their is pretty sticky, others have gone with stock tires and not had problems. I was thinking of going with one of these... but not sure, still need to do a find on them to see whats been mentioned about them.
http://www.goodyeartires.com/goodyeartireselector/displ...mrktarea=Light+Truck
or these... wich look very similar to the dunlops your thinking about. (just narrower I think)
http://www.coopertires.com/us/en/ProductDetails.asp?Pro...le=Light+Truck+Tires