Review on Hatch Huggers: Secure Car Rack Mounting Straps by Saris - Essential Bike Rack Accessory by Oscar Ferrell

If Saris says you should use them on your car, take them. I figured I could get away without using them with my Bones 2 saris. I probably COULD, but I risked the normal hooks coming off if I suddenly stopped and shifted the weight forward. through the sheet metal of your car. (And they're big and soft, so that won't happen) They're easy to dress up with Bones straps. Simply remove the original hook straps and replace them with these. Takes 2 seconds to swap them out. Once installed on the car, the trunk becomes very secure and CANNOT fall off the car even if the other 4 straps fail. (You wouldn't want to drive with the other 4 straps broken. The trunk will fall all over the place. But it won't fall to the ground. This gives you time to pull safely to the curb and repair without running onto the road to see what's left of your bike) I also found the Bones 2 rack to be easier to mount to the car with sunroof latches than metal clips. I can attach the hatch brackets to the trunk first and they will hold the trunk while I attach and tighten the other 4 straps. Without the hooks, the top hooks fall off while I adjust the bottom straps, making them difficult to put on. very good experience.