Wind! Wind! and MORE wind! Be careful and watch it especially when coming out of the interstate cuts through the mountainous terrain. BAMMM! Wind will bowl you over! Make sure your awning is strapped down and cannot unroll as the wind WILL take it if given the chance. Happened to us with our slide topper. Had to replace it. Other than that and the altitude (possible snow & ice) it's no problem. Take your time. Leave earlier than planned (days, even weeks) and take your time. There are hundreds and hundreds of places you will want to stop and see. Did I mention, take your time? Well you should. Because there is nothing (other than God) as beautiful as this great country of ours. See as much of it as you can while you can.