Oh! I forgot to mention, the brother doing the part about using the carts kept emphasizing that a publisher must QUALIFY to do this SPECIAL work.
This is not suprising since we are told we must be footstep followers of Christ and if you'll recall from your study of the Bible that even in Jesus day, only certain Apostles were qualified to man the literature carts. All others had to confine their preaching activity to placing the Watchtower and Awake magazines the old fashioned way.