Those BFG’s are very good in snow/slick conditions. The Z-chains mentioned work well until there is nothing but a sheet of ice, at that point chains with ice-breakers are the only thing that will keep you going. If the road is that steep and covered in nothing but ice, it might not be a good idea to be on that road.
You won’t even need to put on chains, just have them in vehicle, with those tires & 4 wheel drive. If the conditions are so bad that it’s an R-3 condition, the road would probably be shut down anyway.
The traffic will be going so slow that the biggest obstacle will be keeping distance from others when they start sliding. Learn when your vehicle wants to break free and how to brake properly when you start sliding. Know how to put on those cables before you need to use them and also learn their limits.
This was always a good spectator sport;