Good Vehicle. 60 km/h and without jerking. Take the time to adjust the pads where it makes sense. There is a protective film on the buckles to avoid scratching the paint, but I had them in the car. The ropes on the front and back are soft and elastic, so they will not damage the paint. I had the rear end lowered onto my hitch, but I'd probably take zip ties like the hood and put them in the trunk instead of the rope rubbing against the trunk lid. I unbuckled all the straps and was able to slide the kayak sideways, but the cushions wouldn't move. No scratches on the car roof or anywhere else after using. I wouldn't worry about adding two if needed. Very good shelving system!
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