I just did it taking 20 to 59 to 75 to 81 and staying on 81, but I only touched the corner of Maryland as I went on to NY then NH then ME. I hit some rough roads at times also and got off 81 in NY and took back roads the rest of the way to ME. This was not the shortest route, but we enjoyed the trip.
Wade & Debby Griffin
2018 Tiffin Allegro Open Road 32SA, Ford F53 24K Chassis
2012 Jeep Liberty