Any kind of weight you add to the trunk will aid you. You can break open sand bags to use as traction in icy situations. You may want to look into chains or cables to put on your tires when navigating through snow. If you have the OEM 17" tires they are an all season tire so you'll get some benefit out of the tread design. If you are using the 18" OEM's, they are not for foul winter driving so expect complications.
Once upon a time while many of you guys were teething, rear wheel drive cars were common place and all kinds of tricks were employed to get through snow.
Keep a shovel in your trunk, rock salt, sand bags or cinder blocks, and invest in a set of tire chains or cables. There are other items you can purchase to use in a stuck situation to get you going.