I use these a lot in my pickup truck.  If you have a pickup truck, you need these straps.  They should be standard equipment on pickup trucks.  I leave a couple of 15 foot straps connected from the corners of the pickup bed into an X configuration all the time so they're right there when I need to strap down a load.  I have several more stored behind the seat for larger loads.  My old truck is parked outside, and the straps are exposed to sunshine and the elements.  The UV eventually weakens the nylon so I replace the straps in the bed every few years.  They're so much better that the typical tie-down straps.  Much safer too!  You won't lose your load with these straps.  I've been using these high quality straps for probably twenty years or more, including their intended whitewater river use.  They'll definitely keep your kayak on your vehicle.  If you are strapping a yak to the top of your car, be sure to tuck and secure the strap ends, and pull over and redo it if you hear thumping on the car.  The heavy duty nylon is rather course, which helps keep it from slipping under the ratchet even when wet, but if the air moving over your car at highway speeds causes the strap end to slap your car it'll remove the paint, or at least the clear coat.