i did a swap from a dometic 4 door to residential. it wasn't in a Montana but i would do it again. the key is the vertical height. measure your width and i think you can find several residential fridges but they were all taller than the dometic. i had a drawer under mine that i was able to remove and the residential refrigerator fit with 5 " above the fridge that i need to clean up. install an inverter with pass through 120v and auto transfer and as soon as i unplug the rv the fridge runs on battery. so much more space in the residential fridge.
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