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What I did with my 5 wide RR is I got sewer line connectors and hose clamps from Wal-Mart. I had extra screening from a patio door replacement. I stretched the screen onto the connectors and fastened with the clamps. I have a cargo box on front of my trailer and they live in there when not camping. That is as simple as I could get. Hope that is what you are looking for.
if it gets too cool I still crack the windows so the vents aren't right at our head.
We really enjoy the trailer - Just not able to use often enough!