Get a set of chains and keep them behind the seat for really bad conditions. You also need a set of decent tires, there are several types of modern snow tires available. Lastly, keep some weight in the bed. If you find yourself out and it starts snowing bad, keep a shovel handy and just load the bed up with snow for extra weight. BTW, the difference of chains vs no chains will be just as pronounced with an open diff vs a limited slip. I use chains on vehicles with open diffs all the time and they do make a huge difference.