After I installed my BakFlip and went wheeling in the desert I was surprised when I opened my tailgate. The back of my truck was full of expensive electronics. The cases were covered in so much dirt it looked like I had no cover at all. It turns out there is at least a 1/4 inch gap down both sides and across the bottom of the tailgate. The bed and gate do not even come close to seating. When your driving the veturi efect kicks in and litteraly sucks dirt into your bed because of the cover. It's a cheap easy fix. I put adhesive weather stripping around the back edge of the bed to create a seal when the gate is closed. It made a huge difference.