Not really. There were a couple small areas of surface rust. I sanded them then sprayed it over with rust reformer. Looks like it ought to last another 30 years.Just seeing this now. We have exactly the same trailer, but still pretty much original. It's spent a goodly part of the last 30 years in our driveway, sadly. We do have the furnace, which is handy on the colder evenings.
Did you see any concerning rust on the frame when you cleaned out the subfloor? The pics look like the steel was in pretty good shape.