Yes
Yes.
Something broken in the suspension. Maybe just a worn-out shock absorber, maybe a broken spring.
Defective shock absorber , broken spring
Sounds like you may have broken rear suspension parts. Sway bar or spring may be broken.
Could be the dowel in the spring is broken off or lose u-bolts.
Depends entirely on what's broken, there are many parts in the suspension.
May be a broken spring or support
Tow it, a major attachment for the rear suspension is broken.
An air suspension is a form of vehicle suspension in which compressed air is used as a spring.
I would as it increases your stopping distance - I also have this problem on the front since rear impact on my jeep.
The spring supports the weight of the car and allows the suspension to move over bumps. The shock controls the movement of the spring so it doesn't keep bouncing.