I have a loud rattle that seems to come from behind my head when i go over moderate bumps its more of a one time click (sounds more like a tack). after the cars gets warmer inside it usually reduces or stops, all the metal bracketry seems pretty solid so im kinda leaning twards somthing closer to the rear tray, this has got to be a common problem anyone have suggestions??

 

Tighten the spare a little more, and shove a rag between the trunk springs were they cross.

 

probably the spare tire. tighten it up.