Read Thread: Our 13th annual event - Andover, Ma 2019
I believe you are correct but the campground office is currently closed so we can neither confirm nor deny your statement! I'll have to swing by someday soonish and have a look at their progress, otherwise we won't really know before reservations start in January. I'll post all signups if/when I can make a more exact determination.
I'm answering my own query. ReserveAmerica now has that the sites on the road with the 100s + site 48 have electricity (20/30/50) $23/night. Some of the "tent only" sites accommodate RVs.