They improved about 12 sites, which now have full hookups. You can see which ones on the reservation website.
I don't know. Check to see if there is a website for this park, and if so, it should have details to answer your question.
Some sites are full service
Some do. You have to ask for it. Some are full hookup for trailers and some are for tents.
This summer ours had full hook ups, including electricity.
Some do. The following page has all info https://www.ncparks.gov/cliffs-of-the-neuse-state-park/camping
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