Coupler placement

[thebigroyboyski]

I'm having a spot of bother getting the coupler to connect in the right place on my frontrunner.
I can modify the bin to get it to sit where i want but when i go to couple to any other wagon the coupler goes through mine then connects right next to the wagon frame and not where the knuckle was originally sitting.
The couplers look fine coupled together but make the wagons sit far to close together.
What part of the bin do I change to set the coupling point?
Every tutorial i've found just deals with 3 link chain couplings.

[MaineLines]

It's been a while , but I think it is the wagon's FrontPivotX and BackPivotX.

[thebigroyboyski]

Thanks again MaineLines got them hooking up fine now