NOOOOOOOOOOOOO!!!!!!
Blocky tires will get you in lots of trouble in snow. Open tread is great for 4x4 pickups that you off road or go mudding with. Blocky open tires can't grip unless the snow has never been driven on (e.g. you are always the first guy out in the morning and never get in traffic... yeah, right)

Snow and ice need some open tread, but SIPES & STUDS are best.
Sipes grip & bite into the snow and snow pack
Studs bite the ice and sound really cool as you drive along.

Oh, and for stuff in the trunk....
I would suppose sand, salt or kitty litter would be best. It's hard to put old chunks of steel; your mounted summer tires; cordwood; cement blocks or other assorted items under your car for traction if you slid off the road
Sand would make sense i guess

Buy 4 narrow snow tires, listen to the guys in NH, MA, VT, NY, MI, IL, WI, OR and WA. Drive carefully and good luck

PMU
E300DT, 4 Nokian Hakka2 studded on the corners
No weight in trunk, just a winter jacket, boots & 1 gallon of Power Service Anti-gel

__________________
Phil
Previously loved
variety, but I miss the 99 F350 PSD- 37k, traded, damn

Current stable
98 E-300 TurboDiesel, 253k
http://www.facebook.com/people/Philip-Underwood/762882374