Improving snow traction

Weight in the rear, Mud and Snow tire (Toyo M/T's are awesome), and an air locker rear would be ideal.

Studs are for ice and only work in the snow because the surrounding tread is designed for snow.

What's the truck, some can be converted to 4x4 easily, others not so much.

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What he said. Snow tires make an incredible difference. Studs will only help on ice and are illegal in a lot of states. Snows and weight. That's the ticket.