Four wheels normally means a car, right? Well, if you've seen the 3 wheel Piagio MP3 scooter thing you'll have Some idea of this. Easier if you just watch it...
http://www.youtube.com/watch?v=v2OJa-vWEaE
Michael
It's like a not that fast version of the dodge tomahawk...
(http://www.erked.com/wp-content/uploads/2010/06/Dodge_Tomahawk.jpg)
the dodge tomahawk...scary
Tomahawk: I saw that thing at the Detroit Auto Show like 7 years ago; wtf! I would've loved to have been on the build team for that project, "Hey lets build a bike around the VIPER motor! Sweeeeeet....and let's make it huge with 4 wheels!"
How about a V8 mono-wheel. Needs a convention to get it off the trailer, helping hands to move it, and crashes like a mother http://www.youtube.com/watch?v=K4YmVP6i4qw (he shoulda worn gear - I stopped watching once I saw it crash, even though the audio keeps going I figured I didn't need to Hear anything else)
(http://img98.imageshack.us/img98/571/jet2e.jpg)
Michael