Ok, now I feel stupid. I had to take a magnifying lense to see that. I thought they all said 12v, I didnt spot the rail ID untill you pointed that out.
CTRL+mousewheel will zoom in/out without having to use a lens!
So the issue with 12v1 & 12v2 is the lack of connectors, only 4 wires for 20A? FIRE!