This question was raised to the Tredit rep at this year's rally. I don't remember his reply verbatim, but he did say manufacturers do not recommend them due to concerns of extra generated heat and wear to the inside of the tire. There was also discussion about hub-centric vs lug-centric (the wheels on our Montanas) balancing. Apparently very few places are able to balance lug-centric tires and wheels.
Don't shoot the messenger.
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