Hi, I have just released the last version of my 4x4 Autodrive system, and someone asked for a tank rig.
I was already working on this kind of stuff for a while, but it hasn’t a suspension yet.
Anyway, if you want to play with it an even make researches on the way of creating a good suspension system for caterpillars, you will find the current version of my Tank & Caterpillars system on the link below :
http://3d-synthesis.com/tutorials/Tank&Caterpillars-v1.2-Compressed.blend
Have fun !
Philippe.