Investigate caster wheel bounding box / joint

[IDavGal]

The generated solid for the caster wheel has a weird structure, adding an unnecessary bounding box in the middle.
Usually hingeJoints contain a solid as an endPoint which is the link to which the joint is attached. In this case the wheel is attached to an intermediate solid, further investigation is required.
Additionally, the hinge joint parameters seem to have the anchor a little off of the wheel's center. It could be related/fixed together.