Over the bumps my Chimaera is making some banging / rattley noises eminating from the boot. Initially thought it was either the spare, the roof or the toolkit banging around - but sadly not.
if its happening when the fuel level is low , it sounds like the baffles have gone in the tank . Happened on mine , caused by the carbon filter blocking and pressurising the tank.
Have a look in the boot at the back of the tank to see if one of the control boxes has fallen down the back of the tank, they should be velcroed onto the top of the tank.