Just noticed today that there is water around the inside door frame and the carpet is damp around the right rear door. There are no obvious places where it is coming from, any ideas where this may be from? I have had the third brake light gasket replaced a couple of years ago but when that was leaking there was water around the rear window seal and the back seat was damp.

 

it sounds like your drain is plugged up for the ac..that will cause water on the passenger side floor..

 

Did a little more checking and it looks like the rug is a little wet directly behind the rear seats. The back window frame is dry.

 

I've seen reports of leaking rear windows but I don't remember if that was with the "sliding" window or the "fixed" window......
I think it was on the "sliding" window, could be wrong...
which one do you have?

 

Some have reported that the 3rd brake light (mounted on roof) has leaked and allowed water to enter the cab. It was a common problem awhile back. You may also want to check this as a possible leak source.

Do a search on "leak"... you will see this.