My experience with JWs at the door was the same as others. I feel that the WTBTS trains the R&F to drop-off and move to the next door.
As long as you do not initially condem the WTBTS, JWs will engage in conversation. My conversation started with asking them if they understood what the "No Solicitation" sign meant and which hall were they from.
During the course of 30-minutes I invited them several times to my condo to verify what I said about WTBTS doctrines or to study the Bible. I engaged in conversations with up to 4 men and 1 woman. I always tried to ask them simple questions about how they felt and to do independent research. Based on their responses they either were lying to me, don't read the Watchtower or Awake!, don't remember what they read, and/or don't want to know what is written in the WTBTS propaganda. I doubt that any of those JWs will take me up on my offer to read the Bible with them without WTBTS propaganda.
Peace be with you and everyone, who you love,
Robert