My ride 135 is almost as long as my crv, I use the bow and stern lines in addition to cam buckle straps for my own piece of mind. I have a Honda CRV and the bar span is only 28 or 30 inches, I also use the Malone saddle up pro, so I know the kayak doesn't move laterally.
One of my worst fears is having the kayak fly off and injure someone else. I do as many checks as I can, but sometimes we miss things early in the morning or after a long day of fishing.