Here’s a cheap, simple, and effective way to help load your kayak on a car top rack if you’re using “saddle” mounts. Thanks to Cap’n Bob for coming up with the idea of slipping car wash mitts over the saddles. First, this allows you to more easily load the kayak on the rack from the rear of the vehicle, since the hull slides over the mitts. (Use an old bath mat with a rubberized backing to protect the car roof behind the rack.) California kayak tips
Now I’m using mitts on the front saddles as well, because it adds a bit of non-scratch cushioning. As long as straps are tightened properly, and you use front and rear tie-downs, slippage should not be a problem. I had no trouble on a windy trip to Lake Tahoe at highway speeds of 60-plus.