Rear creaking sound when turning into tilted driveways and braking hard

2005 SR5 4x4. I have this creaking sound that seems to vary from day to day maybe based on temperature? When the car "leans" or kind of "twists" when turning into a driveway I get these creaking sounds from the rear of the truck. It also happens when I brake hard and the body kind of lifts up in the rear from the barking, and goes down. Seems like this has something to do with the suspension. It is NOT the rear seat (the sound is coming from the very, very rear--maybe left rear corner). It is NOT the spare tire. It is NOT anything loose inside the car or storage compartments such as the jack or lug wrench. Any input is appreciated! Driving me NUTS!!!

 

Creaking I'd lean towards bushings. Probably sway bar. I have so many creaks, squeaks, and groans that I need to track down right now. Coming from
the rear that's the first place I'd check especially since it's happening mostly when you're turning in.