If you are totally off grid, what will be your power source for the fridge? Do you have solar and how much solar? What is your battery capacity?
As for getting the old fridge out, you may need to remove the doors from the fridge to fit through the door.
If you are wanting to get away from the propane/electric standard fridge, look at the Amish cooling unit by JC Refrigeration. They make some replacement cooling units that are 12 VDC powered compressor units.
https://jc-refrigeration.com/
If you are off grid, the propane/electric fridge is your best choice for low power usage.
Ken