ZR Rear Knocking / Banging

Going over bumpy roads the car seems to have this annoying bang coming from the back end.. its like somethings lose but cant locate it.. ive taken everything out the boot including the spare tyre.. hasnt fixed the problem.. parcel shelf out, spoiler tightened up...



Sounds like its coming from underneath the car though.. I have checked the exhaust and its all fine.. What else is there left to check?? It seems to be coming from the passenger side... the noise also gets ALOT worse and frequent.. even on straight roads.. when theres someone sat in the back seat/s ... I was thinking towards the Arch Liners been loose?

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