I-95 to I-695 to I-70 to I-68 to I-79 to I-64 is a good route. It avoids the PA turnpike and associated tolls and I think there is usually less traffic than on the turnpike. There are some ups and downs in WV and Kentucky, but I don't think they are any worse than I-70 to Breezewood and the PA turnpike although there are no tunnels. There are commercial parks and COE campgrounds in the
Sutton and
Burnsville, WV area off of I-79 which should be about halfway.
Safe travels!
Trailertraveler