I think without any real data, there is no way to say how these tires will wear. Put it this way - I have had mine since April and they haven't hardly worn at all. /forums/images/graemlins/smile.gif But, my rig is not a daily driver and lately I haven't been on the trail but a few times. /forums/images/graemlins/grin.gif
I think if you are looking for a tire that works well in snow, you should not look at anything other than a TrXus STS. But, sounds like you need a tire that is multi-tasking. What is the best "All around tire"? Not real sure - who has tested a tire for all types of terrain?
Back on the IROK issue - I mentioned in a previous post, Interco built these tires for Rockcrawling not driving down the highway. So, tread wear (the way most people wear out tires) is a non issue. If you are wheeling every weekend - it probably doesnt matter which tire you select, youre bound to wear it out.
Tire selection is so controversial to people who do not know the facts. Interco builds every model of tire for a purpose. You wouldnt mount up a set of drag slicks (Interco does make them) all the way around your truck, then claim they wear too fast on the highway. Same as you wouldnt use a set of TrXus STS tires for Mud.
The reason for the lower tread depth on the IROK is to save weight. Rockcrawling rigs need to be as light and strong as possible and saving weight on the tires not only saves overall weight, it lowers the stress on the drivetrain. Wear is not a factor in a competition tire. When it wears out, you buy a new set.