It wouldn’t be the Geneva Motor Show without some weird and whacky concept from Rinspeed, and thankfully 2012 won’t disappoint on the weird factor as this preview look at Rinspeed’s new Dock+Go concept confirms.

Best known for its construction of oddball but impressive concepts like the James Bond-esque underwater sQuba and eXasis glass car, Swiss tuning and engineering firm Rinspeed is revisiting a previous theme with its latest concept, the theme of shape-shifting cars.

Like the previous iChange concept from 2009, the new Dock+Go features a flexible body design with a relatively unique three axle configuration.

The idea of the third axle is what Rinspeed likes to call a “backpacks on wheels.” These single-axle “packs” serve a variety of purposes depending on the requirements of the day. Thus, neither unneeded space nor superfluous weight is carried along if they are truly not needed--they can just be left behind.

As we’re sure you would have already guessed, the Dock+Go is based around a Smart ForTwo minicar. But it’s not just any kind of Smart ForTwo, it’s the zero-emission Smart ForTwo Electric Drive. On a full charge the Dock+Go will take its three axles over a distance of 75 miles according to Rinspeed, which the Swiss firm says would be ideal for a pizza delivery driver or other small-scale delivery business.

2012 Rinspeed Dock+Go Concept based on the Smart ForTwo

2012 Rinspeed Dock+Go Concept based on the Smart ForTwo

Note, if you’re after more range, Rinspeed notes that the backpack can be fitted with a compact range-extender or additional batteries. And to top it all off: when the pack with the range-extender or additional batteries is docked and the vehicle is not in use, the pack will even provide electricity to the owner’s private residence or serve as a buffer for the public energy grid, in effect turning it into a “smart grid.”

Rinspeed states that the Dock+Go is currently going through the Swiss patenting process, and who knows, we may even see a production version one day.

Follow our ongoing coverage of the 2012 Geneva Motor Show by accessing our dedicated show page, and stay tuned for the event’s first press day commencing on March 6.