Nix the fine grit flap wheel.
I've done some polishing on the 345, and some sanding where I had to. The sanding was always done wet with an air powered jitterbug, final wet-or-dry grit was 2400. Even with the 2400, visible scratches were dificult to polish out.
Be sure to get a variable speed buffer, one that goes as slow as possible. I use a Makita at 600 rpm, and sometimes wish I could cut that speed in half.
Be REAL careful on large areas, as it's way too easy to get the larger areas too hot.
So far, I have found that each panel has it's own characteristic, and each panel responds differently to different types of polishing.
I have Nuvite, SS, 3M, and several others, each panel seems to respond differently. I think a lot has to do with how the panels were worked. The curb side quarter panel seems to require at least three different polishing techniques.
Then again, maybe it's just me.
Keep us posted on your progress!
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Trailer '78 31' Sovereign
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