They were the creation of Charles Bird a youth marketing specialist in the early '70s.
As a youth marketer he was a regular visitor to college campuses where he noticed the popularity of VW Beetles amongst students.
So he decided to turn them into mobile billboards.
Students we put on contract and paid $20 a month to drive them.
Nothing new or exciting about all this sort of stuff these days.
But back in 1970 it most certainly was.