You can be +/-16 degrees to hitch/Unhitch in a conventional manner. You can hitch/unhitch at more severe angles by lifting the hitch plate over the saddle and pinning/unpinning the hitch plate from the saddle.
But regardles of angle, the pin must be centralized to the receiver. If off too far (left to right) hitching can be a problem.
But the angular spec is not a big deal at all. And in fact is better for the trailer anyway. Hitching at a severe angle can put a heavy side load impact on the elevator legs. That is never a good idea. As it can cause damage to the elevator legs. A straight on hitch is much better because the thrust is in alignment with the wheel chocks.