Check the
manual.
3 wires, positive, negative, and remote on.
1 Positive = battery power
2 Negative = negative battery
3 Remote-on = Ignition switch.
I think running the wires correctly instead of rigging it will take just as long.
I don't recommend rushing it. I'd do it after the camping trip, and take your time. (lest you fry something)
IE: Do not run a negative wire from the negative to the chassis on the M2-ATX.
Good luck.