when driving through snow its often better to keep your tires a little overinflated anything. as others before me stated it helps prevent rim damage and in snow the less surface area you have the better (more weight per area on tires = better traction in snow). I personally keep my tires at about 4 psi over the recommended amount, so 38 in front and 36 in the rear. The stock tires do ok in small amounts of snow, but anything more than a couple inches i'd be very very careful! Be safe and have fun in tahoe!