I install a 14" round X 10' long aluminum spiral pipe on my Hobie 21SE trailer back in 1989. Built myself two end caps, one that is sealed made as an inside fit and the other goes over the tube and has two stainless steel suit case latches so it can be locked. I glue some red silicon rubber inside the removable end cap to make it water tight.
One my 16 trailer, built a 10' long "mail box" out of 1/8" aluminum walk plate. One end cap is welded and the other is just like a mail box door with a gasket Two sets of sails fit on the shelf and there is a redwood tray 10' long under the self for my rudder assemble. This sail "tube" was built in 1985 and still looks new.
I am not very internetee a word that Damion coined some time ago so I can't post some photos on this platform. I can post some on Facebook if anyone wants to see my setup.
I am better with a hammer....
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Bill 404 21SE
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