If you were only running those tires at 80 psi, that would definitely be a cause for the higher wear on the edges of those tires. Need to get them up to 110 psi and your wear will be much less. Scrubbing when making tight turns also contributes to wear on the edges with these tandem axle rigs.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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