Transporting my kayak
The minimum requirement to transporting your kayak by car is a padded roofrack and webbing straps. This is the least secure way of carrying the kayak as the kayak is prone to shifting due to side-winds, and bow and stern ties are advisable. The kayak is prone to damage when strapped to a bare roofrack as the load will be placed on two relatively small pressure points on the kayak, and this may cause star cracking or worse, especially if it rests on a lighter deck section or hull section away from the bulkheads.
A padded pair of upright bars bolted to the roofrack help by stabilising the kayak in side winds, though not necessarily from damage if it sits on a point away from the bulkheads. This may be lessened by resting the kayak on its side.
A better solution is to sit the kayak in V or J shape cradles. These cradles stop the kayak moving in side winds, and maximise the contact pressure point areas, especially if the cradles line up with the bulkheads. For cars with roof bars close together, bow and stern ties are advisable. If the bow and stern are tied down through the toggle ropes, check the condition of the toggle ropes after every use as this does greatly increase the rope wear. Cradles are also better for keeping two or more boats apart, and prevent rubbing and chafing, which may be severe if the boats are covered in sand.