That is an "E" rated tire, aka Load Index of 123, with a capacity of 3,417 Lbs. which is less than 7K (the axle rating) for two. Insufficient for your Montana and it has *NO* reserve capacity.
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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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