Rich,
You think like we do, which is why I couldn't wait to make the reservations. When I talked to Phyllis (I think??) at the campground she told me that all of the full-hook-up sites around the playground area were being used and held for the rally. The map can be viewed at
http://www.gettysburgcampground.com/sitemap.htm and the sites are the double sites on the left side of the playground, the single sites on the right side (up to about 86 - the higher ones on that side are seasonals and all of the alternating facing pull-through sites on the right side. H. John correctly identified the 50 amp sites on a previous post. If I have jumped the gun on the reservations, I apologize, but it is not in my nature to wait until a couple of months beforehand to plan anything. We like to pay for most everything well in advance which sort of forced our hand.