Get some of the air out of the tires!!

Hard full pressure tires won't float or conform to the road. Whenever I go snow wheeling I drop my tires down to 6 PSI. Whenever it snows out here and I am driving on the road, I run my tires at 14 PSI. As long as you arn't doing 60 miles an hour, all the excess heat the tires generate from being underinflated will be absorbed by the snow.