I agree you can do it on most any bike ... If you have the skill set to do so. Maybe someone will post riding their Goldwing or Streetglide but my opinion was based purely on your comment stating you had limited experience. As I mentioned in my first post, I have buddies who would not think twice about taking their GSA over the passes and the going up is pretty easy ... The steep downhills are more of my reasoning.
Either way, have fun and remember picking us a 600 pound bike at 12,000 feet is a little more difficult than at sea level.