AzScorpion
Moderator
Hey Jeff, The seal should be on the inside of the tailgate so you need to close the tailgate after you secure the tonneau cover. You can adjust the rear bed rail clamps up or down to get a tighter seal. Not sure which cover you have but they're all relatively the same as far as the install goes. The install video below shows how to make the adjustments.Hey Steve, it might not be a truck vs. you thing but a tonneau thing. Just put a roll up tonneau on mine and in order to keep the seal tight with the tailgate I have to close the tailgate first then the tonneau. Not sure if that will work for the solid ones though.
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