Hello George and

. We are glad to have you join us and we look forward to reading of your adventures and experiences. I am sure you will enjoy the website and forums. Good luck, stay safe and keep us posted.
The transition can be done if you are willing to not need refrigeration when boon docking (no power or generator use) or have a large bank of batteries and an inverter to power the domestic refrigerator.
First you will need to remove the original refrigerator, measure the rough opening and see if there is available additional room by modification of opening to accommodate the new refrigerator dimensions. Also notice the lower and upper vent openings in side and roof of the coach. These will need to be blocked off with a change due to the fact that a domestic refrigerator does not need them and in fact will allow drafts, bugs and debris to enter the coach.
The suspension of your coach will have a lot to do with the life span of a compressor driven refrigerator. These compressor motors are supported on springs and a rough riding coach will shorten the compressor's life and will soon become noisy as the springs weaken or motor jumps off of these springs and the motor falls against the can it is in.
If you change to a domestic style refrigerator, there must be devised a way to secure it into the cabinet without damaging the sealed system. Also the doors will need to be secured or they may come open in transit. This will take some research specific to the make and model of refrigerator used. There are some generic ways to do this but are difficult to describe without many pictures or in person. You can do a search for previous discussions on this topic by clicking on the "search" button. Good luck.
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Mike, Certified Master RV Technician
Amy, RV Merchandiser; Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser w/ Banks & 2 toads