I used a common 12 volt double USB plug.
Link to outlet on AmazonI dislike the added LED that the world seems to crave as I'm usually boondocking. While it's a few dollars more than an illuminated plug this was the only non illuminated one I could find. I used a 1 1/16 hole saw and mounted it in the bedside table cabinet. The back of the plug protrudes into the pass through storage though it's up high and out of the way. I ran a wire up the corner of the trailer using a self stick cord cover from home depot and tapped into an overhead cabinet light.
Here's the link to the self stick cord cover.
Link