It's MY jeep! Passenger side shackle has inverted on me on three different occasions. Two were while offroading, and one was while flat towing. i believe the flat towing was due to driving/turning out of a semi-steep driveway. Anyway, I don't know what brand of springs I have. I bought it that way and previous owner didn't know either. So what i've noticed is when the springs flex, the bottom end of the shackles bend inward-towards the vehicle, rather that outward/away. I've read on blogs and sites (such as Quadratec) that it isn't unheard of for this to happen, and some simply fabricate a bump stop of sorts, or use tow shackles, only use them with the pin/tow connection point facing inward, thereby prohibiting flex above 45 degrees.
Attached is a photo of the current setup. Thanks in advance