Luggage Trailer
This is a fiberglass reproduction of a mid-century Westphalia utility trailer. It's a $1K box that drops onto a $200 Harbor Freight frame. I don't see what's to keep you from putting it on the frame backwards and using an eight-ribbed beach umbrella to fashion a collapsible boattail.
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I like this a lot. The elastomeric snubbers for my Westy are unobtainium. Which is holding up getting it on the road.