I have heard that a classic volkswagen product can change 6volts to 12 volts(inverter) in order to run 12v items(radio, stereo) but staying with the traditional 6v for the vehicle. Has anyone seen this or have done this

I would rather be late 10 minutes in this life than 10 minutes early for the next

The reason my lady and I have been together so long is because of the kids. Neither one of us wanted sole custody