1. I've made one track first, without joints and then copy it, then added and connected joints.
   They can behave diffrent, there is also sliders to control left and right track, but I didn't touch them while running.

2. Actually, there is no suspension. Wheels in the middle are mounted on hinges. They are clones but have their own joints.

3. ~0,5cm difference. Could it has a matter?

4. It starts parallel. However, a minimal turning appears after start.

5. Well, there is something hidden what i forgot to unhide. Every wheel looks like here:

http://i40.tinypic.com/2dudtm9.jpg

6. Definitely no

Sorry for my english...

Hello!

I try to make a model on tracks (some kind of tank of something). Actually I've done the model, but when it drives through obcastle it's left track start to fly and then lock.

The movie shows what I mean:

Model:

http://www.filefront.com/15894829/czo%u0142g-better.skp

Any ideas?