My trailer plug provides AC power to plugs and fridge, and also to the converter which transforms the AC power into 12V DC. I don't have solar because solar panels would be horribly inefficient at 50°N, and it is quite expensive to install. I think one would require quite a big solar setup to run the fridge, and considering how well it keeps food cool during the day while travelling, I've never seriously considered finding a way to run the fridge while travelling.
My fridge has an AC, DC, and propane mode. If I plug my trailer in to my 120V outlet using the adapter, I can set the fridge to AC mode.
When you say you will put the fridge in the back of the truck for now, that confuses me because I don't know of any TM fridge that was movable like that. I believe all TM fridges throughout the years could run on propane, making it a permanent appliance.
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