The Triclotron is a 3-wheeled vehicle that demonstrates some building ideas. In particular, check out the front wheel mounts and the rear wheel!
Click any image for a larger version.
< The front wheels are able to tilt left and right independently.
< Here's how I built the rear wheel. Unfortunately, LDD does not recognize this as a valid connection. I used a similarly-sized hub in the tire in order to position it properly.
LXF File - Brickshelf Gallery
-Toa Of Justice