Just purchased a blower for my 2012 X540. Has HDAP rear tires. Thinking though for MN winter snows chains would be helpful for traction. Have 2 suit cases for extra rear weight as well. Question is what will work for chains. I have nice sealcoated blacktop and wondering if the rubber chains are worth a darm or will metal chains be needed. Just dont want to ruin the asphalt. THanks.