I'm planning a trip to Tahoe from the Bay Area in a couple of weeks. Have a Model S 90D with 21" turbine wheels and all-seasons tires. My understanding is that the 90D performs very well in the snow without chains, but that in California there is a legal requirement to carry chains in the car. I've heard that a couple of Model S drivers have been forced to put their chains on at "chain control" checkpoints. This seems like a potential problem because as far as I can tell the Tesla recommended chains only fit on 19" wheels? And from what I've read they're already pretty hard to install on those wheels. What are my options here?