I'm happy with these racks and the bundled cam-style cords for the bow and stern. We've used them twice, most recently for a 5-hour trip with highway speeds around 70 to 75 MPH. The kayaks feel very secure and stable. I have no problem loading the kayaks onto these; I just put a rubberized bath mat on the roof behind the rear Seawing and slide the kayak forward onto the rack.To deter theft, I did not use the plastic knobs that came with the racks, opting to purchase separate washers and lock nuts. Maybe that added to the stability, I don't know. Anyway, if you want to go this route, look for "metric flat washers, stainless steel, 8 mm" and "metric hex nylon insert lock nuts, stainless steel, 8 mm x 1.25 mm." I bought ten of each, eight to install and two to replace the ones I will inevitably lose, and they cost me about $3 plus nominal shipping. It is kind of a pain to install these -- you will want to put a towel down to protect your car from the tools and parts you drop. A ratcheting wrench (13 mm in my case) is a big help.The included bolts are 50 mm and 60 mm in length. If you think you will need shorter bolts, as I did, you will want "metrix hex bolts, stainless steel, 8 mm x 1.25 mm x 40 mm." However, the 50 mm worked fine on a 2007 Toyota Sienna with factory bars, so I ended up not needing the shorter bolts I bought.Hope this information is useful to somebody, it took me a little while to figure out the size and thread of the included hardware.