Victim was a liquid manure truck - fully loaded!
http://www.flickr.com/photos/dasphotography/4912617227/
http://www.flickr.com/photos/dasphotography/4913221848/
The crossing had one mast signal, and one cantilever (which was destroyed in the accident, as you can see if you browse more of the pictures). It was one of the few gateless crossings left on a CN mainline in Wisconsin. It will surely get gates when that signal is replaced.