Number one is double pink knockout

Number two look like Dr. Huey rootstock

Number three looks to be double Knockout

Patty, thank you very much! I just looked up Dr. Huey and I would guess that you're right. All of the growth is very long and floppy, and I wasn't sure why - but now I see it's a climber. I'm not sure it will have a place in my garden going forward but I am glad I'll be able to tell its next owner what it is and how to deal with it! I think you're also right about the two knockouts. #4 is the only remaining mystery. Its growth is somewhat leggy and long too, so I'm wondering if it's a climber as well.

I’m clueless on the fourth one.

Here's another pic of number four, showing the long stems. I think it has to be a climber of some kind.