Visited here the weekend of January 19. I highly recommend it for winter car camping, especially if you have kids.
I tried several campsites and all were either officially closed or snowed in. Sugar Pine Point is right on Lake Tahoe and was reasonably plowed, right up to where I could park the truck. Furthermore, it had metal boxes for storing food, picnic tables, fire pits, and was just a short walk to the lake.
We had easily over a foot of snow everywhere, temperature in the morning was 25 degrees and it climbed to 33. About as good as you can get if you want snow.