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I saw those two threads ... I like nice rounded fronts like in those threads, but you can't fabricate them with a piece of plywood.
The point of this thread is to get some aero improvement with little effort.
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The limit on material choice was not called out in the OP. So slap a sheet plywood on there, it'll make for easy A-B-A testing.
Here is a material called PolyMetal. It is 3mm thick and as stiff as 5/8" plywood. It cost about twice as much. (Now will it be easy
and cheap?)
Edit: How do you propose to fasten that mouldy dirt-magnet to your shiny metal trailer?