I'm curious about how the folks who gave bad reviews are using this product.  I've been happy with it in my F350 crew cab.  I can see the "risk" of pinching is there but that's never been an issue for me.  At full extension needed for my bed, there's a little bend in the bar but it still holds firmly on my Rhino lined bed walls.  I suspect a slippery plastic bed wall would require more pressure to hold firmly and thus not work as well thus the comments of needing a finer ratchet to make that little bit more extension.