I am trying to decide between Irok radials and bias in the 39.5 variety heard alot about the bias plys but not too much about the radials. what kind of mileage are people getting with the radials are they bad. I drive the truck for truck things and a handful of times a month to work or into town when its running its not my dd. I like to drive up to the mountains alot and play around and camp. Primarily I do mud and trails.