I am mounting Rigid Duallys in my rear bumper. I plan to have them on a 3-way switch to run them independently of my reverse lights. But, I also have LED reverse lights on all three of my trailers. Is there a way, without hacking into a bunch of wiring, to actually tap the reverse light circuit of the JKU to make the trailer reverse lights go on as well? Ideally I'd be tapping a wire somewhere up under the dash. I realize that I'd probably have to use some the device inline that only allows power to flow one direction (solenoid? Having one of those brain freeze moments here) so that my power doesn't backflow into the canbus system. Thoughts anyone? I also want to do this exact thing with my dome lights if someone knows where to tap those too. Thanks.

 

Please be more specific about what you want to do with the dome light. As for the trailer lights. Here ya go:



In this case, I wouldn't recommend a 3 position switch. I would recommend a 2 position switch. Since the 3 PSW has an OFF position, you may forget and leave the switch in the OFF position. But this still works with the 3 PSW or the 2 PSW.
You will have to rearrange the harness on the trailer lights.

Edit: I forgot to draw in the fuses. "On all three feeder circuits".