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I found tonneau beat straight cap for FE but I it really depends on the particular truck and tightness of the nut behind the wheel. The flow field is impacted by many variables including three dimensions (height, width, length) plus ground clearance. Cab shape has more than nothing to do with flow over the bed area as well.
To answer a question with a question, how does your highway FE compare with ATV in the bed versus box empty? That seems like a prudent starting point for your particular situation.
We "might" help with interpretation of field test data but be careful about thinking somebody else's ideal solution will work for your truck just the same. That's a sucker bet.
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