Eagleback: I believe you should be using the single wheel chart, not the dual wheel one. You have a single wheel om the end of each axle rather than duals (like a dually truck v. a SRW one). Both the 80 and 85 aspect tires are rated over 3,000 lbs. at 80 PSI which is the limit for 2006 era rims.
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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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