2 for a single, 4 for a double, however it depends on the size of the car and the size of the site. Some double sites hold up to 6 small cars. If you will have more cars then space available, pick a site in the lake view loop. Then you can park on the road outside the campground and be close to your car still.
I believe 2, but if it's a group site you can have multiple vehicles.
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