I used my M2X on the Edge-V. The Edge-V does not use the VIN-to-VIN cable when mated to the M2X. So like you, I have plans to hack that cable, by cutting it in half and having two VIN connectors for future power supply uses.
Look forward to your projects.
And yes, the Truck Dashboard project done by @tschultz is very nice. He is a nice fella and may be a helpful resource for you when you go down that road.
Your enthusiasm is contagious. Good to see. Have fun.