Most likely you have 7K axles. There should be numbers stamped into the axle that indicate the weight rating. You can ascertain the rating by looking at the placard on the driver's side by the propane locker. That placard lists the VIN number and the rating of the installed axles.among other important facts.
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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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