DUDE!!! this is what you gotta do to stop a rattling hatch
#1 GO TO HOME DEPOT
#2 find the cabinetry section
#3 get some of those little rubber dot things you put behind drawers to keep them from smashing the wood
#4 get some of those felt things you put on cabinet doors to stop them from smashing and make them silent.
#5 put the felt things on the ledge that the hatch thing sits on
#6 put those dot things behind your License Plate
and FINITO! you should have a lot quieter car, now if it's the ACTUAL hatch itself liek the metal shit, i dunno bout that.