All good advice.
My parents have a vacation home in MA, lovely place, and once a year I drive up and back. No firearms, no ammo.
AVOID MD at all costs if you have a firearm in the car, they scan out of state plates and cross reference carry permits and pull you over and turn your car inside out.
I drive to Charlotte, and up 77 to 81, you avoid most major cities, avoid heavy traffic, bad roads, and all the crazy tolls. That route takes you all the way to NY in the easiest way possible.
And it's a beautiful drive to boot.