OP, it would help if you put this "FYI - my 2014 Tiffin Red" in your SIG. Your Cummins has a grid heater on the intake so once the "wait to start" light goes out it should start in any temp. Going E to W or W to E you do not need to add anything to your fuel. Going S to N and shutting it off could be a problem, but if you fill up with local winter fuel before shutting it off you will be fine.
Even when boondocking I can heat my engine off of my AquaHot, but unless it's below freezing I do not. You are worrying about this too much when in southern states.