I was wondering about those bridgestones - Duravis M700 (265/70/17) on my 2008 GMC standard bed, CC and 2WD. I put two 60 lbs of sandtube on both side of the wheel well to put some weight on the bed. I live in PA and often drive across mountains - drive to work and back home. Havent got snow yet but I want to prepare. Do you know if Duravis M700 are good in snow? Or do I need to add more sandtube? Thanks