I have installed a couple of these BLUE SEA USB ports in my trailer. One in the bed area and another one in Home Entertainment area. These are wired into the 12VDC lines. I am a big fan of the quality of BLUE SEA Marine 12VDC products... Available from AMAZON. WALMART has USB ports that you can plug into a cig lighter socket.
I noticed one on EBAY the other day that a small digital 12VDC LED readout on it which would be handy for you to get a glimpse of the DC VOLTAGE READING when camping off the power grid.. Don't remember who made it...
I don't think I have ever seen one mounted in the ceiling light fixture or bedroom wall light fixtures. My POPUP trailer has a PHONO PLUG in the ceiling fixtures for plugging in a 12VDC fan. I don't think I would like a cable hanging down from one of those anyway.. A permanent mount in the back of a shelf or table top would be more convenient for me to use.
Roy Ken
