Annoyom,
You are not alone. Sis has a GMC motorhome and all were built with 16.5 wheels. Firestone is the last US manufacturer, and they are now only setting 8.75 tires. I was told by the rep that there is no plan to stop producing those. Find out what your wheels are and either search junk yards or find new wheels. Even thought 16.5 are still produced, they can be difficult to acquire.
Frank
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