Anti-Roll Bar Issue

[BRABUS R230]

Hi All, whilst I was driving I drove over a speed-bump then my Anti-Roll Bar poped up (not a problem) but since I have retracted it I can constantly hear what I can only discribe as a constant dull rattle or even something swinging to and fro from the boot area whilst driving, when I stop the sound continues fro a breif moment (around 10seconds) then stops.
when I start driving again the sound starts again!!
ant ideas?

 

[television]

Thats a hard one,all I can think of is a hose that has come lose once the roll bar fired, have a look around in the boot but you may not see much as everything is hidden by the side and rear panels, they do come out fairly easy.