I got a taste of some cold in January. 1 degree. That brought a lot of my TTs shortcomings to light. I have recently completed a project to help cope in a future cold snap.
What I learned is that you just can't fool around with cold. If you are not prepared, you are going to have issues. Might easily end up with a unliveable rig and expensive repairs.
The temps that you are considering (-30) are way more extreme.
For these temps, you gotta pull out all the stops. You need a generator, heated pipes and tanks, better insulation, and lots of propane along with a space heater or two.
Don't try to skimp on the heat. It needs to run a lot, maybe constantly. I am really not sure that the economics are going to work.
I don't know enough about your rig for specific recommendations, but those basics are a good start.