I would consider 18's with Scorpion Ice & Snows...I am running 18's on my 4.6, although we have not had snow I head they are killer in the snow. I had Hancooks (spelling) on the 18s last year and they went like stink through 15 inches with no problem and stoppen on a dime...they were basically shot so I replaced with the Scorpions. You can't go wrong with the Scorpions.