The backpack on wheels looks to extend the limited range an average electric minicar can go whilst also creating further practical features. The Swiss company has chosen to base the new concept off the smart fortwo.

Rinspeed has announced their latest concept in the form of the "Dock+Go" mobility concept. The "backpack on wheels" looks to extend the limited range an average electric minicar can go whilst also creating further practical features. The Swiss company has chosen to base the new concept on the smart fortwo.

Aside from the obvious increased cargo space, the real innovation is found inside. Within the exterior there is an energy pack with a combustion engine or range extender. This allows limited range electric cars to substantially increase the distance they can travel between charges. The rotating third axle attached to the docking unit's two wheels is used to recharge the on-board battery.

The backpack on wheels can be designed to suit different needs. Two such examples stated include an integrated heated box for a pizza delivery driver or a toolbox pack featuring compartments for craftsmen.

Rinspeed founder Frank M. Rinderknecht also refers to the concept as the first "Vario-Hybrid" and it will be unveiled at the 2012 Geneva Motor Show.

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Rinspeed Dock+Go mobility concept announced