Just bought a new XR4140 HC and love it but I am trying to figure out if I need snow chains on ALL tires or if I can just get by with front chains? Any thoughts would be appreciated, I only get a couple of snows that are plowable each year (mountains of NC). I do have a long and some what steep driveway. Had an LS XR3135 with 7 ft snow plow last year and got stuck on the hill but the XR4140 is heavier with larger tires (but don't think that will make a difference on packed snow!). Thanks for any experiences!