Hard to find - Thule 887XT Slipstream "load-assist" carrier (supports up to 50% of your kayak's weight while ensuring there is no contact made with the vehicle - roll over rear end of car). The rack fits most kayak sizes and shapes for safe transportation.
Demo video (copy url and paste in browser) - https://youtu.be/jRSzdcAr6Vg?si=wPPtqqMxaXJwykqp
Cost new - $350.
Carries 1 kayak, requires only one person to load/unload
Sliding roller extends beyond the back of the vehicle and supports up to 75lbs, 36 inch width and 50% of the kayak's weight to simplify loading and unloading
Pivoting support saddles automatically conform to nearly every kayak shape and size, including fishing kayaks, for secure transportation
Double-coated, heavy-duty steel design for long, corrosion-resistant product life
4 touch points of padded support conform to the hull for added protection
Includes all straps to transport one kayak;
Fits Thule square and rapid aero bars, as well other round bars and most factory racks
All you need is standard load straps (2) with padded buckles and two ratcheting bow/stern ropes