I didn't suggest anything "minimalist".
My comments were based on the information you provided in your photo which did not include a RTT, a trailer, or anything else.
Here's what my setup, using the suggestions from above, looked like when I was done. It worked quite well on multiple extended trips with my wife, son, and dog. We have used both a dual burner stove (shown) and 2 smaller stoves (still have two burners). With this setup, the food and cooking area was accessible without removing anything from the back of the vehicle; making lunch stops very quick and easy. Recovery gear is in the back of the drawers over the rear axle.
Testing the layout of the cargo area (tie downs not installed yet)
Fridge slide is installed using thumb screws into T-nuts. They can be removed when the fridge isn't in use, leaving the cargo area free for groceries, soccer balls, or anything else.
Onboard air is hidden behind the interior panel (ARB compressor). Air outlet doesn't interfere with the drawer opening.
Pelican case is secured to the drawers using the handles. This allows the Pelican to be opened and closed without requiring any straps to be unhooked first.
Mac's Tie Downs use the same technology as that used to secure airplane seats. The drawers are secured more than well enough to anchor additional items to it.
I'm from Seattle. Keeping dry is important to us as well. With the tent open (and optional changing room atttached) the cooking area is very well protected from wind, rain, or snow.
I'm not interested in arguing with you. They are suggestions based on my own experience with a setup that has been used and tested on dozens of trips. Feel free to adopt or ignore any of the ideas as you see fit. Good luck with your project.