Found this on myspace, kinda intresting it's a 6000 pound semi that it pedal powered.

MySpaceTV Videos: NON-MOTORIZED TRACTOR AND TRAILER by ~~ARMORED BICYCLE~~~RON~~

If you click on " by ~~Armored bicycle~~~Ron~~ " that's on the upper right above the suscribe, you will see some more video's of his pedal powered vehicles.