Only that I understand this correctly by the translation. Gripper arms and loader do not ask how far away the wagon is, but how far away the track is? Ok, this is not so good news. Means there is no easy way to widen/narrow the "cargo box".
I suppose we could get the loader wider, but that would cause numerous other problems. Maybe we need a kind of overloading crane (a whole new item) - but since the mod is not further modded and "only" kept running (thank you for that), it will probably never happen.
Very sad but there is nothing you can do. I thank you for your patience, time and explaning.
In case I will probably use the optics to love an armada of red grappling arms on both sides of the ship.
Have a great time and thank you.