If I'm not doing S gauge, Marklin 3 rail HO, or 3 rail O, I also dabble in N scale. Micro Trains, as they are wont to do, have a couple variants on very similar cars. Gosh the tooling costs must be astronomical, but so is their customer base.
Anyway, I have a couple different waffle sided box cars by them, and I noticed on one, the trucks are somewhat inboard, and the couplers have longer shanks on them.
Here is a photo that I grabbed off the web that illustrates that.