This thread is a bit old, but I spent some time at Thule, Greenland. What I'd like to add:
1. Synthetic gear oil for the axles and transfer case. Even then the ADD front axle may stop working in bitter cold temps. You may have to preheat the fluid
2. Synthetic motor oil. I've used both Castrol Syntec 0W-30 and Mobil 1 0W-20. You can search for my used oil analysis regarding both, some caveats apply to Mobil 1 0W-20. In either case, a pan heater is probably needed below -50 F
3. Synthetic power steering fluid. Also, for winter put some pipe insulation on the power steering hoses. You can use a Dexron ATF in the Toyota PS. Redline D4/D6 has a rated pour point of -76 F. The Redline power steering fluid is rated to -50 C. At -45 and colder, the power steering can stop working altogether without the proper fluid and prewarming
A lot of companies claim their extension cords are "flexible" at -40 and colder. Don't believe them. Use 14 gauge as the smallest, consider 12 gauge if you can find it. Do NOT try to bend the cord in extreme cold, it will "snap" and you'll be SOL