Xtracycle
Its a complete system and its fantastically adaptable. You can call it a "Longbike" and there are now several ways of getting one.
Surly Big Dummy. Buy a Surly Big Dummy frame and build it up with the range of Xtracycle accessories
Xtracycle Free Radical. Take your bike - any bike - and add the kit the converts it into a versatile load carrying vehicle.
