currently in the process of updating a 2001 90 series land cruiser prado, adding a few small electrical parts, and wondering if it's possible to add an accessory powered bus bar? say run a wire from an accessory fuse to a relay, then from the relay connect to a battery? just with looking at adding a few things, 2 dash cams plus replacing the rear mirror with a digital one since I can't see out the back with the camping set up there, couple gauges, extra usb ports/ cig lighter to the rear seats for charging, you get the idea, lot of wires and multiple fuse splitters which is where my idea came from? On the one hand this sounds like it should work fine, but also I've only tinkered a little with car electrical work so could be missing something?