Interestingly while I was playing with the turn signal yesterday I noticed the 12V stuff inside the trailer works when I have it plugged in to my van's 7-way connector.
It's defiantly something between the battery and the converter. (Or the battery itself).
Under normal circumstances this would be something I would enjoy troubleshooting and fixing myself, but I got to thinking about it yesterday and decided that since it's brand new I'm going to have the dealer do it.
I'll let y'all know what they say tomorrow.