Originally Posted by Dsardone
Let me clarify- puddles are on the floor of both back seats, driver side and passenger side. As well as underneath the trunk where my spare tire is.
Mine is doing this exact same thing. The spare tire well and the back seat floor are definitely separated. I believe left/right rear floor wells are connected under the center hump. Just cannot see it because of the padding and carpet. So if a leak on one side only it will distribute equally to both sides after sitting long enough for water to saturate.
However in my case this leak is due to recent body work. Car was dry as a bone for 6 years but immediately after rear quarter panel and rear gate replacement it has leaked. Car is going back to the body shop in a couple weeks to fix this so I will ask them after what the cause was and possibly might apply to your vehicle. At least it will give you a starting point to check.