You can also just go overkill like I did and design a full aux power system that ties into the battery and fender ground with a set of 6 ga wires
. All of my aux accessories are powered off of this, including the ARB twin. I do have one fusetap inside the vehicle to get an "IGN ON" signal for some switches and other items in there. Obviously this was a ton of work to design and buid, but it's been a very clean, reliable, and safe setup, especially compared to multiple wires/fuse holders/fuse taps laying around under the hood (which is what I had before).