What rear suspension is this?

I can confirm broken/tore up/shredded upper shock mounts due to air shocks on four California Desert cars... One of them I still own but I replaced the shock crossmember 30 years ago....

But I've also worked on hundreds of Mopars that had Air Shocks on them that the crossmember was still perfect...

probly depends on how much they are aired up and for how long , and what load is on them...