Mike,
I've experienced the exact same type of wear on all six of my G614 tires. I also discovered my alignment was out of whack after one tire in particular was wearing improperly. Bottom line, after 30,000 miles of towing (nice and level, by the way, 110 psi all around, monitored closely w/ PressurePro and nowhere near overloaded on any axle), I've had to align all six wheels, and I've replaced three of my original six tires.
Not a great track record, but things seemed to have stabilized over the past 10,000 miles or so. I'm hopeful things will continue that way for a while. I feel your pain...
Rick
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2007 Int'l 4400 from 2L Custom Trucks
2013 New Horizons Majestic, F41RL4SS
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