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Yes, Alcoa does not make a budd style rim that will carry the 365 tires. If you want to convert, the studs have to be replaced to fit the new wheel.

The change to 365 was made to increase the safety margin on the front. Many with earlier coaches either had Newell retrofit to handle 365 rubber, or did it themselves.

I think the coach you are looking at is solid side, no slide coach? If so, the front end weight will be less, and conversion away from the existing tire would probably not be worth the effort. But that is a guess on my part.

Thanks, yes this is a non slide coach. That is what I figured that the slide coaches were the ones that were getting a bit heavy. 
I definitely do not want a different size tire if I can help it, and especially the 365's that are only made by Michelin is definitely a deal breaker for me.