My rear cargo area carpet & insulation is getting wet when it rains hard and I can't seem to isolate the problem. It seems to soak the insulation first and then bleed thru to my carpet...seems to be coming from below or somewhere that it 'pools' and spills...then migrates underneath carpet. Mostly wet at extreme rear of vehicle at sides and in front of threshold / kickplate strip. I'm pulling up the carpet and investigate tomorrow...any ideas?