My wife's family lived in the Pittsburg area and the closest campground we could find was the KOA in Washington, PA. It's out a ways but the FREEWAY ride is quite fast between Washington and Pittsburgh. They have both backins and pull throughs with 50 amps, sewer, and water. It's quite a nice place and they are in the Trailer Life Campground book..
My son and I are jealous. I grew up in Pittsburgh and never went to a game. Now that I'm older and wiser, (but no longer living in the area), I bought some tickets on EBay year before last and took my son. Great time!