rim conversion 16.5 to 16?

Gargamel wrote:
Hello everyone! I have a 1978 Dodge Jamboree Rallye. It has a 1 ton chassis I believe and I think it's a B350? Anywho it has 8.75R16.5 tires on it and they are very expensive to replace and tough to find so I've decided to replace the rims with 16's for practicality sake.

I've seen from looking around the interwebs that many others have done this and have found some good information about it. I guess what I'm wondering is what models and years of Dodge or Ford vehicles will have the correct rims (8 lug) to go on this beast? I know Chevy/GMC won't work as the center bore hole is too small. I found this out the hard way when my spare wouldn't go on after a blow out far from home.

Also, would regular truck wheels work with a vehicle as heavy as this or will the rims need to be a specific type to handle the load capacity?
Any help would be greatly appreciated. I have tons of reservations coming up and four old tires on now with no spare so I want to get this figured out as soon as possible.
Thanks!