That's odd. Most 12-volt stuff I've had any experience with-- with the possible exception of tire-inflators-- are not worth the bother. Refrigerators that don't actually cool anything, coffee-makers that take longer to boil water than it would take to cross half the county for a cup of joe and so on....
Most 12-volt appliances that most of us come in contact with are Road Pro brands, which is owned by DAS Companies out of Palmyra, PA. They're made in China, cheaply. Not a fan.
Resistive heat applications, like air conditioning, electric heating (including coffee makers and water boilers), clothes dryers, etc., are not very good with 12-volt current. With 12-volt it requires a low amp draw, therefor it takes considerably longer.
The $100 or so thermoelectric coolers do work, but they only cool things down about 40 degrees cooler than ambient. Cold cuts and soft drinks in there when the cooler is in the house or a dorm and it works great. Not so great in Laredo in July.
The high end fridges, like Norcold, Whynter, Engel, a few others, they'll flat keep stuff cold (or frozen if you set if on freezer). But you pay for that kind of 12-volt efficiency. $600 for a small one, $1200 and up for bigger, $4000-$8000 for a side-by-side refrigerator/freezer you'd put in a house. If you want a really good portable 12-volt fridge, any of them on
this page will do ya. Most are low amp (2-3 amps) draw. The thermoelectric Koolatrons and Igloo coolers will draw 5 amps.