Do all campers have to check in before 5pm or just one per campsite? Can cars drive in after 5pm if we are camping there?

Like others said, they have a gate that closes at 5pm. Don't bother to call, they don't answer the phone.

They have a gate that locks and you will need a code to get in after 5

Not sure, but give them a call. They always answer.

They lock the gates at a certain time. Try calling to confirm.