tank treads and tank control sistem

Hello, i've an hard question for you: I'm creating a war game that includes tanks and helicopters, but now the heli is not my problem. My REAL problem is how to make the tank looks real, example: 1. treads must move (but i'll do this setting their Texture offset) and they must deform they vertex to fit the terrain. 2. the tank must move forward, backward and must have a brake force like the M1A2 abrams and must have a suspension sistem.

That's all. I hope that someone can help me ;). If anyone can make a tutorial or have already a tutorial...you know...would be appreciated. Thanks a lot bye