The 20" tires have a slightly higher carrying capacity compared to the 18" ones. I have never had a problem getting replacements. Discount Tire carries the Michelin's and 20" replacement tires can be found at Costco and Les Schwab. Oh yea, my 2015 F350 with 20" wheels has a GVWR of 11,500.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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