Another thought that comes to mind: Lots of cars have a thing that they do, where the tires lean inwards relative to the vertical under a heavy load. This is to add some stability to the car when turning (and because stopping it from happening is kind of like stopping the airplane's wings from shuddering in turbulance). In a tired car, going around a prolonged turn might puck on the "leaning" of the tires enough that the tires (*not* the suspension) tilt/lean to the left (assuming you're in a right-hand curving exit ramp).
This would also work with the fact that it only happens to the rear end of the car. Cargo weight gets carried on the rear axle, so those joints loosten up more readily, and will be more likely to flop like this.
(no subject)
This would also work with the fact that it only happens to the rear end of the car. Cargo weight gets carried on the rear axle, so those joints loosten up more readily, and will be more likely to flop like this.