We are an Aussie family arriving in Vegas on NYE and then planning to take 5 -7 days to drive to Snowmass via the Grand Canyon, Monument Valley and the Mesa Verde National Park. From there we are planning to go via Durango, Silverton and Grand Junction to Snowmass. Can anyone advise on issues with roads on that route in the first week of January? Any nasties that we should know about? We are planning on hiring a RAV 4 or similar. Thanks.