When I replaced the front crossmember, I was planning to leave it exposed and paint it whatever color I end up using for the tongue. After looking at it for a while, I decided it need to look more finished. I wire brushed and painted it with rust converter, then got down to business.
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I used .040 aluminum and cut the piece I would use to cover the crossmember. This would then be slid between the exterior skin and the metal support plate.
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The lower support undeneath the front window was in the way, and since.040 doesn't bend all that easily, I drilled out the rivets holding the support and took it off. Plenty of room now. I'll just rivet it back on when I do the rest of the riveting. An extra 4 rivets is not a problem when I'll be doing a few hundred.
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The sheet in place and held with kleckos. It hung down underneath the cross member about 2 and 1/2 or 3 inches. Just enough to bend back up underneath the trailer. A rubber mallet and patience is all it took to get it to bend the way I wanted to.
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The finished product. Aluminum looks so much nicer than steel. I don't know if the trailer originally had aluminum there or not. I know that newer Airstreams did, I like the look. The best part is not having to wonder, when everything is all done and I'm camping, if I should have covered it.