Hey AircraftKiller
Thanks for the information. Yeah I tried modelling it with less segments and it looked like you said, a rotating hexagon. I'm using 3ds 2008 for this as I'm working with W3D, hopefully you're technique works with this version too...
Also, I have been using a reference image, it's just hidden at the moment. The tank I'm making is going to be unique to the universe I'm conjuring so it's not supposed to be an exact replication of a real life tank.
Thanks a lot for your help.
PS. Nice truck!