wiring, interface, etc. Even if I could get the module to work, I'd still have to interface it with the tablet somehow, which would probably still lead me down the sixaxis hack route, so the only thing the gmlan module would save me is the gm steering wheel button hack, so it's not worth the money. If you know more about these modules than I do, please enlighten me. If there's an easier way to do this, I'm all for it.
I'm running a complete 4-way active network in my car, powered by JL XD series amps. Check THIS out to see my build thread.