Originally Posted by zonatandem
Never seen or heard of it.
However some of the Europeans have a unique/cheap way to carry a tandem flat on a car roof. Inflate a large inner tube and lay tandem flat on top. Secure with bungees/tiedowns running over tandem and through the slightly open car windows.
They claim it's quite secure, even over those bumpy Belgian cobbles!
The way I transport the Tandem. Only thing I do is take the wheels off to lighten the lifting load and strap the Bars to the frame to stop them digging into the roof of the car. Ideal cheap way of transporting the Tandem if, like me, you mainly ride from home with only the occasional trip where you have to go by car.