Very. Google Caltrans R2. R2: Chains are required on all vehicles except four wheel drive vehicles with snow or all season tires on all four wheels. Whenever there’s more than an inch or two of snow on the mountain roads, Caltrans puts checkpoints up and inspects every vehicle. For vehicles that come in both 2 and 4 wheel drive, they look for badging or even inside to verify your selector is in 4x4. Besides badging there is no way for a road worker to tell the Tesla variants apart. It’s not like you can see the differentials underneath.