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Stack the containers carefully, jam two or three 2x4's or pieces of thin wall conduit or most anything long and straight on top, pull the tarp over to make your own one-time use el cheapo streamline topper.
My brother's F250 cools nicely with only the tow hook holes open when the temperature is below 50 deg F. Above that, he opens the lower hole.
My truck has had the grille fully blocked for two years now. Engine stays at same temperature, so no need to open it up in summer.
If you grille block, you need to watch the engine temperature. If it rises enough to kick the cooling fan, open it up.
Photos are in my profile.
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