I have been thinking of getting an electric cooler, which can refrigerate or freeze, to transport ice cream, etc. as the store is about 40 miles from where I live. These are low energy compared to a mini-fridge, but thought I would bring to your attention in case this type of product would work for your purposes. This one is really quiet, but doesn’t have wheels, which is the reason I am hesitating, but has a lot of reviews and highly rated at Amazon. There are smaller ones as well. I use a normal chest cooler now and am not super happy with it.
BODEGACOOLER 12 Volt Car Refrigerator, 53QT(50L) IPX4 Waterproof Electric Cooler, 31dB Ultra-Quiet Car Fridge APP Control with 12/24V DC 110-240V AC, -4℉~68℉, Portable for Truck RV Camping, Travel