rigged tank tracks in blender game engine, how to make them work?

hi there, i have a tank model complete with tracks that i rigged following this tutorial (https://www.youtube.com/watch?v=LovMyPoW6Ko), i parented the “hull” cube to the tank mesh which i then added a simple motion logic bricks to, expecting it to make the tank tracks and wheels roll…which it didnt. i was wondering if anyone can suggest how i would get them to move/roll in bge, or if i can at all?

many thanks
tom :slight_smile:

the guys in the game engine section will probably know what the problem is.