If I was compiling this model for FS2004 via makeMDL, the centre wheel could start its animation XYZ axis at any angle, and only taking seconds to keyframe those parts, no triangle node/s are required. The suspension / compression and wheel all become children of c_gear but only the wheel is required to have an animation part name because it is automatically keyframed by the FS2004 stock animation process.. The suspension operates as part of c_gear but does not require its own animation part name, you can call it anything. I worry about the future of freeware AI with the bulk of conversions being done on models more than a decade old and built visually very low to save on poly triangles for simulators and PC's now long past there useby date.