Thumping/clunking from rear end area what could it be?

My 2014 Pathfinder suddenly developed this issue today. It wasn't gradual leading up to now it is just now happening as of this morning.

I have a thumping that feels like it's coming from somewhere under the back seats. I had my dad ride in the back seat while I drove around the block to confirm. If I let off the gas it changes to a very loud clunking noise from the same region.

I jacked up all 4 corners earlier, spun the wheels and confirmed there's nothing stuck in any of the tires. All...

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