Re: Wanted: Rear captain chair
I'm sure there are plenty of places in Indiana, home of all the RV/van converter supply houses, where you could pick up a seat and base. Probably not too much out of your way if you are driving from SLC to Ohio.
Maybe SMB Indiana could hook you up... have you called them? When I bought my van I asked them if they would install a third chair in my SMB, but they apparently don't do any retrofitting of older vans. But maybe they would at least sell you the chair.
Otherwise, I see used captain's chairs from conversion vans all the time on Craigslist. That's where I got mine.