tire chains

I (personally) would not tow in snow/ice conditions. The brakes on the trailer will be ineffective, and the tow vehicle will be compromised because of the additional weight/torque being caused by the trailer. 

In California if a chain control is in effect, the tires on the drive axle of the TV and the tires on one of the axles with brakes on the trailer must have chains, even if you have aggressive snow tires.  [https://dot.ca.gov/travel/winter-driving-tips/chain-requirements#:~:text=All%20vehicles%20towing%20trailers%20must,tires%20on%20all%20four%20wheels.]  The idea of the chains on the trailer is to give it some braking traction.  I believe standard linked tire chains would work.  Personally, I would delay crossing the mountains if there was a high risk of chain controls being implemented.  While I lived in NV, I carried chains crossing the Sierra Nevada Mountains because even with a fair forecast, a sudden storm could pop up.  But that being said, I would not attempt to drive with chains while towing unless it was a matter life and death.  It's always better to just wait out the storm.