Winter weather is here (though it isn’t official until Dec. 21) and that means we need to find better ways to travel through the snow. This is one way. GMC has turned its Sierra 2500HD Denali 4WD into a winter specialist by fitting it with four tank tracks instead of wheels. It comes with a monster 6.6-liter turbo diesel that supplies 445 horses and 910 lb-ft of torque, according to the company. It comes with a six-speed automatic. No price was given.