Thanks for the picture Aaron. I have come up with pics of gas and diesel trucks with the tank door in different locations, so I really don't know.
The 2007-10 Diesels did not have the urea tanks yet - I think that started with the 3 gen SD in 2011 model years. My 2009 does not have urea, 2012 does.
Either I never pay attention or it's not common, but how many Super Duties have those style mirrors (on the USFS truck)? Thought they all had the two post, large style...
Edit: I found the other battery on the sprue - it's attached to the coolant tank in the upper left of the sprue…good!