just as a general rule of thumb, questions from you about your truck should go in the Tech forum (so they and their answers will become part of the database). :thumbsup: The project forum is more for you to show off your truck and for others to ask you questions about it.
and for water leaks, any and all areas are suspect. try the babypowder trick. after you pull up the carpet, you can sprinkle baby powder around and the water will make trails through it, showing you the direction to where the leak originated. :D