2 Thule Hull-a-Port Kayak Carriers with J-shape cradles for easy loading and transporting.
Yakima "Q-Towers" roof rack for Toyota Prius 2010-2015 or Acura RLX 2014-2017.*
I got this lovely system for transporting my kayaks, but then my transport vehicle died, so I never ended up using it. :-(
*Yakima has phased out this style of rack. It is possible that it would fit on a different car model if you could find the right Q clips.