If you're starting out near I 95 in Pa, you may want to check this route. We've have used it often going between NJ and Myrtle Beach. You avoid 95 from Delaware all the way to south of Petersburg, Va (exit 46 on 95). You will use I 295 around Richmond and Petersburg, but most of it is newly resurfaced, its not a toll road, and it's fine. The only caveat is the construction on the Bay Bridge on Rt 301 (not the Bridge Tunnel, the Bay Bridge over the Chesapeake Bay on Rt 50/301). It's iffy. During the week or early morning/late evening usually not bad, but there was a 20 mile backup yesterday (police action which is very unusual). I just put Smithfield, nc as a destination to get the directions.
https://www.mapquest.com/directions/from/us/pa/philadelphia/to/us/nc/smithfield
Only tolls are on the new part of 301 in Delaware, the Bay Bridge and the Potomac River Bridge connecting Md with Va - this is a two lane bridge - DH says it's "not fun but no real problem". We have a 32'MH and always pull our toad. You might hit some traffic around Waldorf/LaPlata in Southern Maryland (lots of traffic lights) but that's about it if the Bay Bridge isn't bad.
