Rear tires wearing faster than front tires.
I'm running 295/35/21's on my 2010 at 44 PSI front/49 PSI rear (my owners manual 'recommends' full load pressures) and mine are exhibiting noticeable 'scrubbing' on the front (edges predominantly) whilst the backs still look like new (1250 miles so far).
I saw no discernible wear or differences from front to rear. I've been running at 40 psig with very light loading, except for the large driver.
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