I may need to start a new thread, but I'll give you an update on my investigation into Golden Motors offerings. Apparently the MW16-C or -B is not able to go in reverse, but their Magic Pie 2 offers that capapbility. I received the wiring diagram and it appears that the controller is internal since there are only connections for the battery pos and neg and then an 8-pin connector that takes inputs from throttle, regen brake, reverse switch and such.
This motor is the same one being used in the SBU V2 and V3. This being the case I know it can be done, my question is how can I do it with an Arduino?
So, I'll start a new thread to ask about this specifically and I'll include the wiring diagram.