We have been over Wolf Creek Pass several times towing a fifth wheel. We have never had a minute's trouble, but I do consider it one of the more "serious" passes in Colorado.
I respond to this because of the question, "Is there any pass at all?"
My answer would be "Yes, a pass to be prepared for." If you have experience towing in the mountains it should be no problem. On the other hand, I would not suggest this for a first solo experience.