Nothing too much.
* Keep batteries charged up.
* Check battery cables make sure they are clean and tight.
* Suggestion: Winter front to aid in keeping the cold out.
* Suggestion: Do the high idle flash and build my high idle mod.
I'm in the same boat with subzero temps.
I still run the same old petroleum oils in the winter as I do in the summer. I normally don't even plug it in because most places I go don't have power. I don't use any anti-gel or cetane booster because they do more harm than good. Like this winter I've seen temps down to 0*F and no problems starting and still holding 19-20 MPG as a high mark. Wouldn't complain.

arty018: