Looking for snow advice - POSITIVE COMMENTS ONLY

He's not going to the Rocky Mountains, he's going to Durango which is at the foot of the San Juan mountains. I've driven it twice - in the summer - and my recollection is that it is not that mountainous until you go north of Durango proper. Hence my feeling that you could likely tow to Durango safely since you're mostly at lower elevations.

In other words: you won't see treacherous icy mountain roads like those pictured above, if you're just towing to Durango and parking the trailer there.