Franswa, If it weren't raining right now (yay!) I'd dash out and take a photo, but the plug under the rear upper is a 120, just like in the house. The trailer has 3 total (inside), and the one in the back doesn't work. There's another one outside in the
fridge access door -- haven't tried it but something from inside is plugged in there.
There were no 12V sockets until I had them installed (and they all work great).