John, you and Billy are BAD BOYS!!! And I'm not going to let you drive Doughboy ever again - - - unless you want to

Tiki, I have a 3/4 ton, 8 lug, FF rear differential in mine. 16" wheels. I've never checked for aftermarket wheels.
If you just want single rear wheels, why don't you just remove the inner wheels? You may need to press in shorter lug bolts....maybe.
I could be missing something...wouldn't be the first time!