Here is a link to Xtracycle's website. The conversion kit with bags comes in at $299. Add your own mountain bike and you can begin cargo hauling pretty cheaply.
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
Last edited by COcyclist; 04-12-2013 at 01:46 PM..