I would try a junkyard for the wheel. There are plenty of E450 Vans around just double check the bolt pattern. The spare tire is mounted under the rear on my 31g, however it appears to be a Winnebago fabricated item. That's another item you might find a junkyard somewhere. I've retrofitted stuff in the past, such as taking an under mounted carrier from a pickup truck, but I don't know your general skill level are how involved you want to get in something like that. The other option may be a decent welding shop could make something up for you.
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