12 Volt Power Source Cargo Area (1 Viewer)

[MtnGX]

What is the best source of 12 volt power in the rear cargo area (not hatch) that does not require engine or accessory to be "on". The 12 volt cigarette plug requires accessory or engine on. I need 12 watts (1.1 amps) of power. Want to hook up my Kingpin 40" light bar that I mounted under Victory shelf. The two little useless pen light LEDs in the quarter panels and the overhead lamp would probably work but not sure if circuit can handle additional current draw. What might be other sources?