If you plan to take a car on the ferry be sure to book in advance.
Yes, you can bring cars onto the boat. However, like others mentioned, you definitely want to plan ahead and make a reservation with the steamship authority. Prior to your planned trip. As their rules for vehicles are different from their rules for walk on's. Walk on's can call/ book in advance (I believe), but you don't have to. You can purchase tickets when you get there, the day of travel.
Yes but make sure to make reservations online with the steamship authority
They have social distancing rules and folks on the boats i have been on are following them
Assume you mean car, yes both vehicles and walk on are available
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