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Rinspeed is a Swiss speed shop that just came up with the Dock+Go. It is essentially a little backpack that connects an extra axle to the back, providing extra trunk space. It also has a built in fuel cell. It in its concept phase but it seems like a good enough idea that we could see it in the streets soon. I am just curious if it would throw the Smart Car off balance since they were designed for that. I guess maybe it wouldn`t be much different than driving any car with a trailer.
Image Source: http://www.engadget.com/2012/02/20/rinspeed-unveils-smart-fortwo-dockgo/