A lot of my friends use cement (I think its more weight per ci, whatever) bags here in Truckee. I think its a load of horse sh!te. Buy studded tires. Had a buddy with a newer M*****g that he threw studs on, and that mother rallied. Never used chains once, and that was during a bigger snow year. But that's a totally different vehicle. I cant tell you how many Yota "Prerunners" I've pulled out of a ditch. I actually yanked out a second gen Tundra with my old Nissan Hardbody pickup. Dude was pissed some old six banger got his shiny new truck out of the ditch.
Just get a 4x4. Or buy some beater Subi for the winter.