For truck snow tires, many times "reasonable" MT (mud terrain) or AT (all terrain) tires are also rated for snow. I say reasonable because MTs can get pretty extreme in their tread pattern, which will really hurt your stopping distance on ice. Extreme MTs have very little rubber touching the road. On my truck I have Goodyear Wrangler SilentArmor tires, which are rated for on/off-road and extreme snow. I wouldn't recommend them as street tires, as they are loud and wear very quickly on pavement, but just as an example of truck "snow" tires, ATs and MTs often serve the same purpose as snow tires, as well as giving you a better ability to get back on the road if you've gone off in a muddy or rough area.

ATs wear quicker than all-seasons (~50,000 miles). MTs wear extremely quickly (~30,000 miles). Normal all-season tires generally wear at ~60,000 miles.

-edit- also, before buying studded tires, check to see if they're legal in your state/country, and make a note of the legality dates. Many times they're only legal from November through March (studded tires damage the road when the road is dry). Tire chains are temporary solutions, but are practically illegal in many states (can only be used if the chain never touches the road surface).