I actually took the truck in today to get TPMS sensors added to the wheels, rebalance and rotate. I am rotating tires about every 2500 miles (I know its probably overkill). I have run out 5,126 miles on the tires and they are showing a consistent 3/32 of ware on the fronts and 2/32 on the rears so far (thats an average of 1.5/32 on the fronts per 2500 miles and 1/32 on the rears). Tread depth when brand new was 23-24/32. My driving usually consists of a 24 mile - 1 way down a mountain pass to work and return with mixed city driving and Highway (about 50-50) each day. I have also made several trips to Salt lake City and Western Colorado towing no more than 9K. I run the tires at 35psi front unloaded and 31 psi rear unloaded. Tire pressure increases by an average of 4 psi on city streets below 50 mph after approx. 20 minutes of driving. Tire pressure increases by an average of 7 psi on the highway above 65 mph after 20 minutes of driving. I have yet to see a psi change above 7 psi over sustained highway speeds. Seems that the tires "settle in" and then maintain a constant temp and psi.
Off-road I have yet to really air down bellow 18 psi. I do not drive this truck fast over washboard roads and so the tire temp and psi change off-road seems to remain consistent with cold temp and psi. I will be headed up into Tin Cup Pass once again this weekend in an attempt to reach a few high mountain lakes for fishing. I will try dropping to 15 psi and watch the sidewalls.
Offroad traction: Dry dirt and aggregate (decomposed granite), the tires are very good as well is moderate sized aggregate and rock. The tires are not great in mud, thankfully I hate mud and avoid it like the plague (reference to the dark ages when the wheel was made of wood and iron). Last and least, snow, the tires clean out fine but I think could use siping if I was to drive on packed snow and ice for long periods of time... These things howl, they are very round, do not shake, and balance very well.... However, they howl like a super swamper...