Make sure the rack is the right kind for your car, by researching them carefully. Regardless of what system you choose, good quality tie-down straps are essential. It is not uncommon to think the performance of a kayak is poor, when the paddle is the problem. The more you intend to use the paddle or the greater you will depend on it, the higher the quality should be. Make sure it fits, it does not restrict paddle movement, and it is appropriate for your size.
Special designs are available for women, children and even dogs.
When you are far from home and in rough conditions you will be depending on your gear. The best quality gear will then be essential. However, if you will be using your kayak just once in a while for short distances, then a lower quality purchase will be sufficient. Apply this evaluation to all your accessory purchases. Most shops should let you try the accessories that you are considering along with the kayaks that you are test paddling.