I love my TC and using it
I have made a lot of modifications
Others have made a lot of winterizing modifications
Truck campers will be really hard to live in at those extremely low temperatures for 5 or 6 months at a time.
Humidity!
getting rid of the humidity from just breating in the small space requires ventalation... an eye on the stove will make it rain. The walls will stay wet. The bedding too
Do you have a source of electricity? Can you have a meter and RV receptical installed at your expense?
truck campers are built as light as possible... thin walls, etc...
as I said.. I love my TC... but I move it away from the cold... and away from the extreme heat...
I'd never winter in it.
good luck!
sleepy