All the highways you mention are 2 or 4 lane, most with nice wide berm. You might encounter a hill, but don't count on it. You will see much farm land, smell some pig farms, and change speed often for small towns. Watch out for harvesting equipment and Amish buggies on the road. A nice ride. If you want to see for yourself, use Google maps and drop the 'street view' guy onto the highway and take a look.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI