Seventy years back in the early days of motor racing, racing cars were driven to the tracks by the drivers themselves (in the absence of any idea of a carrier). Be it to the Le Mans or Targa Florio or even the Mille Miglia, the situation remained the same - the cars had to be driven by team members to the race tracks. 

But with the introduction of more faster cars that came equipped with more instruments that needed highly specialized equipments and manpower (to monitor), need was felt to have one vehicle that could transport all at the same time, to the racing venue. 

One that was used by Porsche to move their cars under the sponsorship of cigarette maker, Rothmans was this Mercedes Benz O317 transporter.

NOTE: the car in the image is only for representative purpose and does not come with the transporter