Once we hit the dirt we remembered our new back door table had been fitted by the rattling coming through the vehicle...we stopped placed a folded towel on the table and closed it up...rattles were gone...yesterday the trip to the Foam rubber industries where I purchased a 10mm thick piece of quite solid foam rubber...625mm wide just a fraction wider than the table so it touches the support arms and stops them from rattling and 370mm deep which as you can see fills the cavity but makes for a good nonskid table top...I might fix it with double sided Wurth tape...happy motoring