If I am not mistaken, winter mode just starts the tranny in 3rd gear? So why bother going to 4lo if you are going to start in 3rd gear in low, which I would think is about the same as 4hi 1st gear? Just curious. I wish it would snow here so I could play tooI would drive around all day pulling people out of the snow just for fun.
In addition to the straps, bring a few flashlights. It would suck trying to strap a car at dusk or after dark. I would also evaluate getting a collapsible shovel for digging snow from under the vehicle to get to a tow point.