My son and I are driving to Seattle from Chicago the first week of January. We have gotten conflicting advise about which route to go. We are most concerned about the mountain area....90 (can be hazardous and need chains to cross Mts) Vs 80 (heard road closure due to wind conditions during storm) Vs going all the way south to 40 (which adds on a good day). We are driving a Tahoe with 4 wheel drive. Would appreciate getting some advise from anyone who's traveled this route before. Want to go the safest way to ease "MOM'S" mind.