Rear end shifted
It looks like both sets of shackles are being pushed hard to the outside by the springs.
I’d be taking a good hard look at the spring perches. Like are they the correct width? Are the spring pins centered up in the holes in the perches? And once all that is checked, making sure the u-bolts are correct and torqued correctly.
At the least it’s time for new shackles and bushings, but I’d check that other stuff too.
@DoctorDiff sells HD shackles with his front hangers. Maybe he’ll sell them separately if you call?
Mopar Replacement Leaf Spring Hangers