Gary, I have a short box on my F-350 6.5' I too have a tri-fold extang tonneau cover and a headache rack. I take the tonneau off when I'm hauling my 5er. One less thing to worry about. Also, with the trifold folded, You can't see out of the back window to keep tabs on things...just saying.
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2017 Jayco Eagle HT 27.5 RLTS
2016 Ford F-350 crew cab Lariat 6.2L
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