I've had 3 different travel trailers and never had an issue with any of the refrigerators. All three were left turned on electric with propane back-up 24x7, except in January-February when the camper(s) were shut down completely because it was just too costly to heat them.
Now, in our new 5er it has an all electric residential refrigerator. It has dependency on an inverter to keep electricity running when not plugged into shore power, but when traveling, the inverter is powered from the 5er battery and the battery is constantly being charged by the truck. So, while in transit, it works wonderful.
Now, our last trip was just last week, and we got caught short and the last night of our trip home we stayed in a motel. The trailer was not plugged into shore power at the motel, and I did not run the inverter while traveling all day. So, basically, the refrigerator was turned off for about 20 hours.
The freezer and refrigerator temperatures are constant at -2 and 34 (F). After 20 hours the temperatures were 28 and 51. Of course, that next day of travel I made sure the inverter was turned back on again and within 2 hours, the temps in were back to -2 and 34. Nothing had a chance to thaw in the freezer compartment.
So, over all, I was most pleased with the residential refrigerator. It's a Samsung.
The only difference between the Montana High Country 375FL and the 374FL? The 375 has a residential refrigerator and inverter. The 374 has a gas-electric refrigerator and no inverter. I think, knowing what I know now, after only less than 3 months, I'd rather have the gas-electric version. But I'm making the most of the one I have. It is a really good refrigerator. It just take AC power and not gas as a back up.
