Hey - I thought I'd share this b/c I haven't seen anyone post about it.
If you're going to be traveling through WY (I don't know if it's just winter/early spring or year round), check the WY DOT road closures website due to high winds. I experienced getting stuck in Wyoming last March, and in plotting out another drive to the NW, see that the interstate was closed last night, and closed tonight, too. In some places, it wouldn't be much of an issue, but they close it from Cheyenne to Rawlins (150 miles) and there aren't many other roads that exist to get around that. When I studied the map last year, I went to the front desk last of the hotel where I got stuck, I asked the guy there about a route--turned out, it was a dirt road.
If you haven't been through that area of the US, keep this in mind.