I went to a school for Congregation Overseers and Assistant Congregation Overseers in Pittsburgh, PA back in the winter of 1970.
One of the instructors was later GB member Schroeder.
He made claims of going door to door himself during the class. But, in talking with him more at length, it transpired that he and his wife did not go out with one of the local congregations - they had "their own territory". He went on to relate how he had found an old lady who would let them in and talk to them and I had the impression that his hours reported came from that "return visit" instead of legitimate door to door work.
Years later, when he had a stroke and was completely non-functional, somebody used to wheelo him out on the street at Brooklyn Bethel with a Watchtower pinned to his lapel so he could do "out of mind" street witnessing. Some Bethelite of that era posted this here.
So, my impression is that even if a few of them did do a tiny amount of door to door - it is a staged circumstance for appearances only.
Does anybody think the drunken old Judge went door to door with the record players, or set up one of his V-16 Caddilacs as a "sound car" to harras church members on Sunday mornings?