I'm researching the Nova Kool refrigerators right now and considering doing the exact same thing, replacing a 3.0 cu. ft. gas RV refer with a 12 volt unit. I've been looking at the Waeco/Dometic and now the Nova Kool.
As of yet I have zero experience with their products, but I've got to give them kudos for customer service. I've called them twice today and both times the telephone was immediately answered by a real person who was polite, professional, and helpful, which unfortunately is hard to come by these days.
Apparently mobile and off-grid refer applications is 'all they do', a big plus in my mind. And they are in Canada, which is probably good for you.