I heard through the grapevine, smart is looking at offering the bike rack accessory sometime mid-summer 2008 (July time frame).
I will hold off building my bike rack until I see smart's accessory. Being an engineer, I would rather modify their bike rack to accommodate a tandem than build it from scratch.
The rack has to be able to carry in two situations 1) able to carry one tandem road bike. 2) carry a road bike with a tri bike.
I have finally decided against placing bikes on top of the smart. Raising the center of gravity, creating a sail and unable to go into parking structures.
Then I was looked at doing the trailer hitch option but with Michigan roads the trailer will be bouncing all the time. And I didn't want to feel the jerking on the smart.
When I do carry the tandem on the back. The front wheel will be remove making it about 6.7 feet long. The tandem will stick out each side about 9 inches.
Mark
aka Bob_Parr