Blue HZT60, thanks for the pics. This really is a beautiful area. I think we will be making it an annual trip. It is amazing to see what they were able to do with so few resources up there and how well they have stood up to time in such a dry climate. For those that don't know, the willow barn (if like the willow sheep corals we saw) is actually made from 1" and smaller willow branches stacked together between posts. After 50-80 years, they are still solid and held tightly together.
Evolving to chat here I guess, so here is some more tech.
Pictures of the interior of the trailer. I used AGM batteries for safety and reliablility (like optima just no spiral).
When at a campground our at home, I use a trolling motor charger to keep the batteries topped off. When driving I charge through the vehicle using a hellroaring battery isolator I installed as part of my
Dual battery setup into an 87 FJ60 | OlympiaFJ60
The back of my power box. I used circuit breakers from the batteries to the power. One battery is for the water pump and lights. The second batter is for the inverter.
For the inverter I just used a 400 watt inverter I had wired with a relay to switch on and off from the switch panel.

Here is a shot of the water heater. You can see how much space this thing takes up. I think in my next trailer I will use the on demand type heater instead. The second picture is off the whole inside. The water tank is the other item I would change. It is too tall. I think a wider but more flat one would work better for storage space. Even with the limited space I am able to carry the camp table, chairs, tent and shower/toilet enclosure.