''Dock+Go'' Pizza Rinspeed iPhone Car Concept Geneva Motor Show 2012 Global Auto News. Rinspeed will present its newest concept, "Dock+Go" which is a car that has two and sometimes three axles, at the Geneva Motor Show. It is specifically this third on-demand axle that is the crucial point of the innovative modular mobility system. "Dock+Go" was built - in the traditional sense - by Peter Kägi and his company 4erC. The concept draws its charm from easy-to-dock single-axle "backpacks on wheels." These so-called "packs" carry out their assigned tasks depending on current need. But the best thing is: they cleverly solve the much-debated operating range problem that electric vehicles suffer from. Neither unnecessary space nor superfluous weight is being transported. This truly creates "mobility à la carte."