I bought one of these just over two years ago and it has been great. It has been bounced around in the 4WD and has had hundreds of hours of use, the majority on 12V - no problems at all.
https://www.techniice.com/car-fridges/ss-fridge-60l-dual-6hdr.html
https://www.techniice.com/car-fridges/ss-fridge-60l-dual-6hdr.html