Hello my friend
For a begin give a look at:
http://www.themappingdomain.com/index.php
there is a scripting tutorial about how to make a truck move to a certain path and not only. Is the same for a tank,jeep and all vehicles around. If you want more help on that, e-mail me at:
jimmyjbo2002@yahoo.com
Speak you later
-------------> Jimmyjbo