I made a very basic rig/solution to animate tri-cycle vehicles (such as aeroplanes) that are animated with the front/nose wheel, while the rest of the body is being "dragged" behind it. While the content is very simple, I hope the video+content will get your creative juices going. :)
If you can't connect it is most likely because my ISP have problems keeping my connection alive. Just keep trying and you should be able to connect.
EDIT: The AVI-files are much higher quality and requires TechSmith codec, (http://www.techsmith.com/download/codecs.asp) so if you have the bandwidth, I recomend those over the MP4 versions.