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Nice project!!
That looks like a cutout in rear bulkhead for loading /unloading cargo. True? If so, nice touch!
A year ago I was working on a coroplast rear spoiler. I too found it needed stiffening using either 1/8" aluminum stock or similar thickness lauan plywood. I ended up with Kamm roof extension instead but that's another thread.
A few pounds of weight is not a bad thing but stiffness and strength are valuable. Any added weight will need slightly more fuel to get up to speed but you are rewarded with longer coasts due to the mass. It only hurts you if you must brake and so kill off your momentum.
Do beware of too much weight very far back, causing t'ailer to flex outward in turns. Strength is good, as I say.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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