Controlling car animation Spline carriage and suspension

[all90killers]

Hi,
I saw the product demo Product Presentation - Autodesk VFX tour 2008 - Craft Director Studio on youtube at 6:56 you guys show one car being towed by another car by something that looks like suspension or something, can you guys please tell me the add on you used for that.
Later in the video you guys showed a car perfectly following the carriage (at 10:00) I am guessing that the car in this is not following the target mesh but yu have used some different technique to make it go along with the carriage.

I have tried increasing the values to the max but still I am not able to increase the speed of the car following the motion path. I am trying to create chase seq where the camera is also moving very fast so I need the cars to move at a very fast speed but on a fixed path with few drifts and skid.

Thanks in Advance.

P.S. I hope for a soon reply, and I can make a tutorial on everything I achieve through your plugin.
http://www.youtube.com/watch?v=FjY8F6Qf ... EB6E199160