Forum - Craft Animations - 3d animation tools

I can not figure out how to setup a 6 wheeled vehicle that has no suspension. The vehicle is an autonomous robotic vehicle. It is skid to turn (like a tank). I tried the Crawler with Extra Wheel which did the skid to turn just fine. However, I couldn't figure out how to lock-out the suspension. I am trying to get a setup where the wheels have no relative up-and-down motion to the vehicle. Does anyone know a trick to do this?

Using Maya 2012 on a Mac OS and the full suit of Craft Director plug-ins.

Thanks
Russell