This is a video of team 1678’s 2007 robot. It’s one speed, two wheels drive and uses two skids. Wait until the end of the video for a pleasant surprise.
http://video.google.com/videoplay?docid=7006569008259416714&pr=goog-sl
Sorry, you are not allowed to have the driver in the robot. 
Incredible!
If your attending Pacific NW or UC Davis I’ll see you there!