You have to rotate the model itself in Fragmotion or similar.
The truck script has positional values in it to place the wheels etc relative to the body, they would need to be altered to suit a different model.
In addition the script need the models to have the origin point set correctly, for the body the origin should be in the middle of the rear axle.
The wheels need to be centred as a wheel would normally be, i.e. the middle of the hub.
Been there, done that, got all the T-Shirts!
