DELTA- Thanks for offering some sanity this issue.
I was thinking more on the lines of tacking some hat channel to the underside of the cab. I see the logic in saying the seat frame is structural. Considering you have a stamped steal structure spot welded in 5000 spots on the floor.
On the other hand, I know there's alot of trucks running around with bucket seats instead of benches.
To each his own I guess.
Chris