Hey, Bill!
There are several folks who have used galvanized sheet metal to skin their 'drops with, all with decent results. Cathy & Leo Frost of Chico, CA come to mind right away, and they have successfully painted their's as well.
Yes, it's a little heavier ... but on a trailer as small as a teardrop, I doubt that the little bit of extra weight will amount to much in the long-run/end-of-things. It is especially viable when you can't find aluminum in widths over 4'. I considered it, recently, but then found a more-or-less local supplier of wider aluminum ... still am keeping it in the back of my mind for potential future use, though.
What ever works is what ever works, eh what ...

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CHEERS!
Grant
Celebrating
Retirement after over
32 Years of Building, Promoting, Supporting, Supplying, Living the Lifestyle, and Loving
Teardrop Trailers!"Life Moves a Little Slower When You're On Teardrop Time"The nature of Life, itself, is change ...
"Those who matter, don't mind, and those who mind, don't matter." 