We ended up camping in a truck camper at Tahoe Valley Campground after being caught in a snow storm. For a last minute find, it turned out to be an awesome choice. It was the weekend after Thanksgiving and snowing so there were a handful of people at the campground and the entire place was very quiet. The RV sites have hookups (although we weren't able to connect to water because of freezing temperatures) and there are many amenities available including hot showers, laundry facilities and a general store.

It was a little overpriced for the low season, but I guess that's Tahoe. I imagine it gets very busy in the summer, but we had a wonderfully quiet time there. And nothing beats making a fire in the snow and waking up to a couple of feet of white fluffiness!