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The ".. really heavy duty tires like Michelin XPS or Bridgestone Commercial TA..." are expensive and not really heavy duty. They both are Load Range E Light Truck (LT) tires. They are rated to carry 3042 lbs which is barely enough (with no reserve capacity) for 6K axle.
Current Montanas have 7K axles and RVIA specifies a 15% reserve capacity. Hence the use of "G" rated tires with ~4K rating.
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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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