YES
Yes. You need to reserve & pay for a specific tent site & receive a camping/ parking pas for the dashboard of your vehicle, in the office by the entrance of the park
Yes you can
Yes tents are allowed along the D row. Many D sites (4, 5, 6, 7) have electric and water. Know that trains run very close , mostly quick commuters but freight and Amtrak at times.
Yes they have a lot of tent sites and some across from restrooms.
Oh yeah.
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