Personally I would not run a 10 ply St tire on that Montana.. The placard states that as the spec but its a placard...
a 14 ply G rated ST tire is gonna be the winner all around... My 2014 came with 10 ply E rated and the first thing I did was toss those and install 14 ply..
The very next year (2015) my RV and the entire series of floorplans all suddenly cam OEM with 14 ply tires.. In my case it was the exact same model #
Why? Because they knew the 10 ply E rated tire wasn't enough tire..
YMMV
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