I went by my local trailer repair shop today to have the brakes looked at on my cargo trailer. Lo and behold, they had an Andersen on the shelf! The employee behind the counter said that when they first came in he thought it was the stupidest thing and would never work. Then they had one purchased and they installed it. He said he is now convinced that the Andersen is great. The customer loves it and called them up after about 500 miles of towing to say how well it took out the usual up-and-down motions when going over bumps. And get this... he says the Andersen at rest puts NO pressure on the coupler latch! He said he didn't believe it till he saw it, but they were able to pull the latch lever up and disengage the latch, then reengage it freely, while the chains were loaded up. He thinks the ball is being pushed toward the upper and forward part of the ball socket, keeping pressure off the latch.
I told him I would have to see it to believe it, because I can't visualize it. But I know this guy, I'm in the place fairly often, and I don't think he would lie to me. I think the actual installed unit really changed his mind, once he saw it under load for himself.