Dan
SW of Canton, OH is the town of Mt Eaton where Evergreen Resort is and is a Good Sam Park. US 30 W [past Canton & Football Hall of Fame] to US 62 S to US 250 & make a right and it is a few miles up the road. Amish Door Restaurant is nearby, as well as the Amish areas of Sugar Creek, Walnut Grove & Millersburg on SR 39.
If going to Gettysburg, PA Drummer Boy Campground [Rts 116 & US 15] or Artillary Ridge [closest to Battlefields], as both can accommodate larger units.
Stop at General Picketts Buffet or Tommy's Pizza for lunch, near Battlefield & museums. South of Gettysburg on US 15 just over the Maryland line is the National Firemans Museum, Elizabeth Seton Shrine [a must see] & Mountain Gate Family Restaurant [takes you back to the 50-60's era].
For Williamsburg, VA American Heritage RV Park is just off I-64 [exit 231-A] and you can then go to Historic Williamsburg, Busch Gardens & the Water Park from this RV location.
You can do each location in a minimum of a 4 day stay.
Enjoy
Eileen