I'm looking at maybe installing a relay box in my 2010 King Cab, so that I can do accessory power the right way. Out of the gate, I know I want to hard-wire my Garmin dashcam with the parking mode cable, and probably put my aftermarket rear view mirror on the relay box as well instead of having it tapping into other wires like it is now. I'd like to place some LED lights in the bed so that I can see what's going on under the tonneau cover, and maybe some 12v outlets in the bed. How do these plans impact what I want to install as far as relay box gear? What sort of changes would be necessary if I wanted to install, say, a winch or inverter?