In need of a creative solution!

[Apjjm]

AddAttachedProp: Doesn't work. The prop doesn't move around with the wheels.

It should work fine. Any transformation (excluding scale) applied to the wheels in game is applied to the attached prop if:

1) The planets are attached non-central to a wheel entity
2) Each wheel is a separate entity (and not attached to the main wheel base)
3) You have set the arguments to the function correctly
4) Wheel ents have the correct body set in the main physics body custom var.

It works fine with props attached to my katamari ball, which moves in all 6DoF.