Good idea on the light socket.
I've been carrying various connectors for a few years,
I have one for MotorHome park hookups that converts to regular plug in also.
On Amazon you can get a converter that plugs in a cigarette lighter to convert to USB for 99c! Charge your Laptop when on the go.
James and Colleen Tucker.
Aut viam inveniam aut faciam
Beat our time, Los Angeles to Ushuaia 70 days