Gap between tailgate and back of bed. Trailhunter

[Bcphoto3]

I was worried about dust getting in to canopy ( will be using AluCab Contour Canopy). Then I noticed the huge gap between tailgate and back of bed. Especially in corners. Anyone else noticed this? Problems once get canopy on? Any corrections?

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[Sagebrush]

Any corrections?

I used this stuff along the bottom joint. This forum won't allow the Amazon link, but you can find it:

"Yotache Open Cell Self-Adhesive Foam Seal Tape 1/2 X 1/4 Inch, Weather Stripping for Door Insulation, Soundproof, Weatherstrip,"

And some rubber D-shaped seal on the sides. It made a big difference.