or Another idea is:
I would like to thank twiceayear who created the original loader for his fabulous idea, information online and the feedback which he gave me. I originally saw his on youtube and I can see many people have benefited from his idea.
I made a variation based on his for a friend and thought it may be useful to someone so I am posting a few pics as well. For mine, I used a three suction cup loader as it was the only one readily available to me at the time and it was on sale. Also used was two skateboard wheels courtesy of a neighbours garbage, some pvc pipe, threaded rod, locknuts, and wooden dowel to reinforce the pvc and a piece of pvc blind I wrapped the dowl with for a tight fit before inserting. Mine was made higher than typical as there was a spoiler on my friends car and I didn't want to stress the spoiler by attaching it there so had to be high enough for clearance. The kayak flys up to the roof with the skateboard wheels.