I recall driving home after camping in January a few years back, towing up a steep grade (for the area) in middle Michigan, I was losing speed and noticed the traction control light blinking, as the road surface had become black ice. Thank goodness for electronic shift 4wd ... turn the knob and instantly more traction. Was able to maintain my speed and finish the grade without drama.
The year I bought my camper, I towed it North along the lake using my Subaru Wagon, in a January blizzard along I-96 and US-31 from Grand Rapids. Thank goodness for all wheel drive.