That is excellent! However, I am confused about something. There is no load in your drawing. Or is "stealth trailer" the load? In which case, I assume it would be the fridge, not the trailer itself.IF I got your request correct: The drawing below uses a 4PDT relay with a 110VAC coil. The contacts need to be rated to handle the current your trailer will require. Likely not more than 30A. A 40A relay contact rating should do. Only three parts of the relay will be used. The Master Sw(itch) is there so you don't run your battery dead every time you unplug the trailer. You COULD get away with a DPDT relay and use the Master Sw only when you want power. If you're running a battery charger from the mains then it could keep the battery charged. If you want, you can use the "Unused" section of the 4PDT relay to disable the charger when mains are not available.
View attachment 243867
I can certainly understand you and relate. The same thing happened to my ghost guns.I built a Stealth Trailer once. Parked it and immediately lost it. Never found it again.
Now, would you be so kind as to show me which relay on digikey.ca would work for your drawing? Would this one work: https://www.digikey.ca/en/products/...1TGIMNd5D1UVGOTFDCzASpUZoqL-mZUEAxuOnpeBgJHQA
And your drawing shows the inverter connected to the trailer chassie. But looking at the Amazon pictures, I don't see what contact would be wired to the trailer: https://www.amazon.ca/gp/aw/d/B07R584BJR/ref=ox_sc_act_image_22?smid=A30YX8KII65IAA&psc=1
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