For the last 16+ years, I've lived at the top of a steep hill.
I've had 5 rear wheel drive cars & during snowy conditions I found ( through trial & error), that placing heavy loads directly over the drive wheels ( and I do mean directly sat over the drive wheels), seem to help greatly with traction. Things like 4 or 5 bags of sand.
Admittedly dosen't really help with steering,or coming down hills but at least you can get usually get up them.
You still have to be 'sensitive' with the clutch, throttle, brake & steering, but it helped.
Chris