I have been looking at the new Sergent couplers and was wondering if anyone has had any experience with them. I would like to add tightlock style couplers to both my Heavyweights and Amfleets, but am confused as which type that would be on the list, and how well they would actually work. I would also like to use the draft box that comes with them for the most part, that way I could eliminate some pre-existing coupling issues. (Don't stay coupled very well)