If you don't have any experience with the 20's in the snow, then it's probably best to avoid it. However, I have taken my car to mammoth a lot and a few times it was dumping snow. As others have said, it is VERY slick with the 20s but in mammoth if you don't go off on any steep hills and you keep your speed very slow, like 20 mph max, you will be able to get by. I didn't have too much trouble putzing around the town and to the ski lodge. Also, when you're rolling it will feel fine, but stopping is main issue. You just need to start slowing down well in advance, keep a lot of distance from the car in front of you and apply the brakes very lightly and gradually.

I don't have any experience with the roads in Tahoe.

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2022 X5M Comp Dravit Grey/Full Silverstone
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2018 M5 Black/Full Silverstone
2015 X5M Donington Grey/Full Silverstone
2010 X5M Space Grey/Full Silverstone
2003 4.6is Silver/Black