We are planning a trip to the US from the UK in December. We want to visit as many friends and family as possible in one trip in three weeks. We will fly into Chicago and want to drive to Tuscon. We'll mostly stick to Route 66 for this leg. On the way back we would like to do the Grand Canyon and then onto Boulder CO before heading back across Kansas and Missouri. Friends in Chicago have said they are worried as they think this trip is insane and that the weather could be terrible. I would love some expert opinions! We will rent a decent car, probably as SUV, are used to driving long distances and will have plenty of time to do the journey. Am I being unrealistic to think that with careful planning, this is perfectly do-able? Are there any parts of this route that may be impassable/closed/dangerous? I'm happy to come up with a plan B in advance just in case.
Many thanks in advance for your input