Glen, I have no idea. But I thought I'd reply anyways, just to let you know your tribe members are here for you. Steel wool sounds a bit rough, eh? Probably this guy Will knows...

Glen:

What year is your trailer? If it's one of those from the "not quite so shiny" years, you might be able to, but if it's already shiny, or you want it to be shiny again, you probably shouldn't use steel wool, even the superfine four-ought variety. Your best bet (and what's generally done) is to use a rotary buffer and a very fine compound.

Remember, too, that any abrasion you do to the AS will erode the clear coat first, which you'll want to replace afterwards.

I know this is an ancient thread, but for others who may benefit from the info, www.perfectpolish.com has a terrific FAQ on polishing aluminum on Airstreams. Kits and supplies for surprisingly reasonable prices too.

I think the real answer to the original question is: Compound. Either Nuvite G6 or the other aggressive grade that I can't recall at the moment. You really really don't want to use steel wool, nor sandpaper except as an absolutely last resort. And even then, personally, I wouldn't. I'd sooner live with the scratch than create a weird discolored patch that will never blend with the rest of the skin.