that's a great modification to these trucks for those that live in cold areas. Something else to look at is a set of battery heating pads or wraps. I like the pads a bit better but each work. You lift up your batteries and place elements below each of them, run the wiring and done. Even at negative 30 with this combo the trucks turn right over with great cranking power.
I also eliminated the factory fuel filter and ended up replacing with a racor spin on model that was capable of accepting a fuel bowl heater. Just installed it finally last year and its been nice. Not really needed if you run number one diesel or even 50/50 in most places. just food for thought, hope you get it all dialed in my friend.