There is a “group camping area” adjacent to the regular camping area that could accommodate a dropped trailer. I am not sure of their policy regarding this use however. I would call the campground directly to discuss this with them.

I agree with the previous answers, the trailer spots are quite ample.

I don't think so. If there is, it was not obvious.

Not sure about overflow. My spot was pretty long, around 60'. Call/email for an authoritative answer tho: Email: orpi_information@nps.gov Phone: 5203876849