Hello, I understand how complicated it can be to find transportation of this type, more long distance moves of this type, but for your luck a relative of mine lived in Boston and had to get a long distance move just like you are needing, it is that's why I know this company from
here called born to move, they do long-distance removals to several states throughout the country of the United States, including from Boston to Washington DC, so they are the only one I know that I can recommend you