the rattles in my car were coming from a few places
firstly was the boot hatch... i greased up all the rubber so it doesn't squeek when the hatch moves
then i wrapped the boot catch in plastic so it would be a tighter fit, the downside is the hatch is harder to pop open but i hardly use it anyway
the parcel shelf was making a bit of noise moving around, that was easy just taped up the mounting points so it was a tighter fit
alot of the noise was also coming from where the back seat catches are, i taped up and re greased the catches so they didn't move around as much
my drivers window makes a hell of a racket when its not tightly wound up, easy solution
took out the drivers and passengers seats and re greased the rails and tighened the mounting bolts underneath
tighened up the screws that hold the plastic trim on and around the glove box etc
thats all i can remember doing... ps 'they' in mightymods is just me