There are a lot of residential-style propane fridges of varying sizes that are made for off-the-grid cabins where the only electricity is a generator, and may not be available for extended periods of time. That's probably what I would look for. I've never dealt with a residential-style unit though. There may be trailer-style units as well. Camper trailer fridges can work on 120vac, 12vdc (for a very short time) or propane, so there might be something based on a trailer fridge that is portable.

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau