Tonneau cover issue

Hello,

I recently purchased a TruXsport tonneau cover for my taco, and installed it without too many issues (another long story), however, I noticed that every time I go above 20 mph, it tends to rattle up and down about 0.5". It doesn't make noise, but in the rear view mirror it does look obvious. I thought I followed all the steps in the instructions.... any suggestions or thoughts?

Thanks

 

Do you have the clamps in the right positions? Have the same tonneau and that's the only conceivable thing I can imagine allowing it to behave as described... No idea otherwise

 

Maybe.. I did put the clamps closest to the cabin closer because they wouldn't "bite" on the rails, but I guess that may not be too bad if it's tight. I'll reposition the clamps, then. Did you put the clamps far from each other? Or the corner ones far?

 

Spaced them out on ends and of course midway, three per side... There are three different positions they have to be in on the side rails/chanels and depending on if closer to the cab, midway, or nearest the tailgate...

 

Be sure you place the clamps thusly...
Each clamp has three possible positions... The top pic is nearest tailgate, middle pic is middle, and bottom pic is closest to cab end of the bed...