Hi Frank.
I recently installed a second exterior 12vlt socket.
I just connected the wiring to the existing exterior 12 volt wiring under the awning and ran it under the chassis to the front {underneath the boot} area. This way I didn't have to worry about additional fuses, and it was easy to connect the wiring at this point. This is so I can connect my 12 volt shower to the jerry can which sits in a bracket on the front draw bar. That way I don`t have to move the full {and heavy} 20 litre jerry can thats full of water. I simply place my portable shower tent beside the draw bar, drop the shower pump into the jerry can, plug it into the 12 volt socket beside it, and comfortably have my shower out in the wilderness. Best mod I ever done.