For the History Buff- Reese Patent # 5,529,539

Side tilt makes hooking up and unhooking much easier/safer for those of us the camp on a unleveled/off camber campsite where maybe the truck is at a different side to side angle than the trailer.

Wedged pins in jaws or the slot in these type conditions were common. This is a condition that means jacking one side of the truck or trailer till the pin will come out. Or sometimes a big crow bar may work if lightly wedged.