Had to wait until we got home from last trip, as I didn't have the correct wire crimps with me.
Here is my solution. Very easy.
1 - Turn off 12v power (trailer is unplugged)
2 - Found best location for master switch and cut hole
3 - Spliced into master (the red one) 12v line coming into the 3 independent switches. As you can see, the 12v power is looped to each switch
4 - Attached main 12v power to Master Switch
5 - Screw switch into wall....Done.
I can now leave the 3 switches in "on" position and turn them all on with the master switch. If we ever want to turn off a light, just simply use original switch.
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