Unique Off Grid portable freezer

From the looks of it, they're taking Danfoss DC refrigeration systems and wrapping them in a standard-looking case, but with more insulation (roughly twice what is normal for residential appliances).

There's nothing wrong with the concept or the Danfoss components, so really it comes down to how effectively they have executed it and how good their customer service is, questions that can't be answered until they build a track record. FWIW, the Danfoss compressors were originally developed for marine applications and shouldn't have any trouble dealing with an RV installation (except for the usual caveat of securely mounting them so they don't go for a walk when you hit a bump).

The only thing I would be at all concerned about is that there does not appear to be anything shielding the evaporator plates from inside the refrigerator except a coat of paint, something loose with hard, sharp edges could potentially penetrate the refrigerant tubing and wreck the system (my own plan for a Danfoss-based refrigerator and freezer in an RV call for expanded aluminum shields for that very reason). But that could be dealt with by just not putting anything of that description (hard sharp corners, like a metal container or block of ice) into the fridge in the first place. The chest designs appear to be more shielded from that kind of thing, so if I were looking to put them on a highly mobile platform, I'd probably go with those (they would also be easier to secure, not dependent on wall anchoring).