No joke.
We haven't had much rain lately, so I can only assume this has been sitting there as maybe 4" of standing water in the DS rear quarterpanel for a LONG time. With the recent cold temps in Austin, it froze to a solid block of ice. This is a 1989 Grand Wagoneer -> BTW.
I can't figure out how this much water got back into that quarterpanel... the rear carpet is completely dry, so it's not likely coming from the headliner or roofrack screws / gaskets.
The fuel filler maybe? I would guess maybe the fixed rear glass but unlike a rolldown window in the doors there isn't an obvious way for water to sneak past. I read someone posted about a possible bad fitment around the rear quarter panels where they were welded near the tailgate which could allow water in pretty easily... still exploring that.
Anyone ever seen this kind of water intrusion in those rear quarterpanel areas?
-G