"Tires should only be mounted on approved rim widths. If changing tire size, the rim/wheel must have adequate load and inflation pressure capability. For rims/wheels not so identified or for service conditions exceeding the rated capacities, consult the rim/wheel manufacturer to determine the rim/wheel capabilities." (On page 37 it's recommended to consult with the vehicle manufacturer about bead seatings).
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See page #33 in the reference below. (Chapter four addresses RV tire fitments and applications).
https://www.ustires.org/sites/defaul...TruckTires.pdf