I believe so. From my recollection most sites have a car port that is 2 cars wide. Even if your smaller site only has room to pull one car in, there is usually enough space to park another car behind it. For example when we went we fit 4 cars in our port. If you plan on hiking to the observatory try to leave earlier as it closes to the public around 4 pm. Have fun!
There are a few double car spots that cost extra.
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