carringb wrote:
I probably have at least 50,000 miles towing in the snow.
You might already know this, but https://tripcheck.com is the best resource for knowing when chains are required (it'll show a solid blue dot at each affected pass). Chain laws are posted here too: https://tripcheck.com/Pages/Minimum-Chain-Requirements
And yes, chains on the trailer are required. Only one set. Running chains on adjacent tires will make they wrap around each-other and break.
I run Heavy Duty quick-fit chains from Les Schwab on my drive-wheels, but I switched to quick-fit cables on the trailer, because of limited shock-mount clearance. I like these better anyways on the trailer. Haven't had an issue with either. I used to have camlocks, but they're a PITA to install, and the ride sucks.
Idaho doesn't have a chain law, but you could be cited if you block a highway because you don't have traction. But usually, the snow in Idaho has far less moisture than the typical Cascade stuff, so traction is generally much better.
There's no reason to change tire pressure when running chains. Just run the recommended value for your actual tire load. Do make sure your tread is in shape. That'll help immensely in transition conditions, where roads may be slick but chains are not required.
Be careful of morning shadows on east-bound lanes. You can have 3 lanes that are clear, but that dark shadow cast by trees on the south side of the road can easily be black ice.
X2, to tire pressure adjusted to the load on the tires, if you run at max pressure and are only running half load then you are sacrificing traction with too hard a tire.