This is more what not to do, but it's one more experience:
We have rented a double kayak while on vacation a few times, and just put them on a rental car with foam blocks underneath, supplied by the rental place. The kayak end straps tied under the car on either end, and there are also straps that go through the open windows and connect on the other side. I have only drive ten miles or less with this arrangement.
With one rental car, the weight depressed the sheet metal of the roof slightly. Fortunately it was not permanent. I added more foam blocks the next time to spread out the weight. It was kind of a nuisance, and getting the kayak on and off the car was a bit arduous.
We have a 1990's Yakima system we used for bikes and a roof carrier at that time. Then they revised the whole thing and I would have had to to buy expensive new "towers" that attached to the car because there were no suitable adapter plates for our newer cars. I have never bothered.
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