It is certainly possible to polish your post-87 A/S, and it will be a mirror shine everyone will love. Just don't park next to a polished vintage trailer and you will be fine!
It won't look as shiny and will be a slightly different (warmer) color.
We have gone to using Nuvite F7 with a rotary compounder and then F7 again with a Cyclo. This gets rid of the compounding scratches. Then clean up well (if you haven't all along) with mineral spirits, especially around the seams and rivets. Skip the Nuvite C and go right to the Nuvite S polish with the cyclo. Microfiber cloths and flour at the end if you want.
We found that the Nuvite C would make darkish "smudges" when we used it. If you get one, go back to square 1 in that spot and bring it back through all the steps (it doesn't take that long) to get rid of it.
You do have an advantage with the non-Alclad skin. It's the same all the way through, so you can
actually sand out scratches with fine sandpaper, then compound and polish. We call it "getting away with murder" as you MUST NOT do this on Alclad. We've seen many trailers with what we call "polishing damage" where they blew through the Alclad veneer and the only fix is to replace the panel.
Check out Airstream Polishing at Airstreams4rent in Phoenix, AZ
for an example of how a Classic 350 MH turned out. (At least you don't have to strip paint & undercoating on a trailer!) The factory sanded the aluminium under the paint to make it stick better.
Home this helps,