Gee Dale, look what you started!
Hersheymilkdud, I'd be upset too-that kind of poor customer service would drive anyone crazy. I'm sorry to read about it and I've experienced poor customer service and went to another dealership that is light years ahead of every other Nissan Dealership in the area. It certainly made my driving experience a whole lot better.
But that's not solving your problem.
1. Good job on the pictures. Keep doing it.
2. If they say it's a leaking door seal-did they "fix it?"
3. Ask them if why they ruled out a kink in a hose from the HVAC?
4. Ask them under what conditions would they replace the carpeting in your truck?
5. Get that in writing and then send that to Nissan Complaint people.
AS AN OPTION, what about having the carped pulled out of your truck right now? That way, you can definitively see where the water is coming from and that would be the best picture of all! Can't you just imagine the possibilities when you prove you're right?
Either that or go ahead and install Linux bedliner in the bottom, a drain hole/drain plug and wear swim fins...
Let us know how it turns out.
(You too Dale)