Kent, Vickie, and the sissy dog:
We pulled over Wolf Creek Pass heading East with our 45 ft. MH towing a Honda Element and although we are pretty heavy (since we full time and carry alot of "stuff"), it went fine, but it WAS a pull even for our 500 diesel.
I don't think you'll have a problem getting UP the hill, but the most important concern is coming DOWN !! I'm probably over cautious, but unless you have engine (jake) brakes I'd be most concerned about loosing my brakes on the way down that Western grade heading to Pagosa Springs. As mentioned above, keep it in a low gear and take advantage of pull outs to let the brakes cool down.
It sure is beautiful country however, and you'll probably really enjoy staying in Durango. Be sure to visit Silverton and also DO take a day trip over to Mesa Verde Nat'l. Park just West of Durango.
Steve & Lynette