Haven't ever had a Michelin tire that was worth a schitt in the snow. Even the AT2. But I siped those and then they were decent in the snow.
Basically any tire any tire that has a 60k warranty isn't going to be aggressive enough or soft enough to be any more than a mediocre snow tire, at best. So there's that to consider.
None of the Michelin all season tires are aggressive enough to be considered good all season tires unless all your seasons are above freezing, lol.
Also towing in Colorado and long lasting are somewhat mutually exclusive. Colorado climate, roads and curves in the mountians are hard on tires.
We went through tires MUCH quicker when living in the mountains. So depending how much you're up in the hills has an affect.
I'd look for more of a medium agressive AT tire like Toyo AT or Cooper AT3. Smooth and silent on the highway, but enough tread profile and void space to be good in rain and snow, or excellent in snow if you sipe em.
