I haven't done anything with it really, but notice that it was there. After some more internet searching I found a forum comment somewhere that said the Laramie SLT package did come prewired for fog lights. It sounds like that could be it. I found a number on the connector (52772), but it is apparently used for lots of different applications, so that wasn't a help. I also looked up oem fog light kits, but none of the plugs looked like this.
I've probably already spent too much time researching...but inquiring minds want to know! I was hoping someone recognized it. Thanks for all of your input.