Here is the thread I started when we replaced our Norcold
http://www.irv2.com/forums/f54/new-f...dow-93522.html There are enough threads about replacing them here to keep you busy for a long time. Just type things like "residential fridge installation" or anything with "Samsung" in the search box.
We found out later that the reason the new Samsung would not fit in through the door that Lowes sent us an RF217, not the RF197 we ordered. Three cubic feet bigger but also taller. They had removed the box at the store and the two look identical.
Removal wasn't too bad. Unplug it, disconnect the gas, remove any screws, nuts and bolts you can find and see if it will move. Ours fit out the door.
Some things to think about. How much work on the cabinetry needs to be done? We had to lower the shelf the Norcold was on to make the new one fit. Close or don't close up the vents. Some people have others have not. You will need to plug the LP hose or remove and plug the fitting. We just plugged the end of the hose. Don't plan to ever go back to and RV type fridge but who knows? Maybe a future owner will. If your Norcold has an ice maker, a trip to the hardware store should get you enough parts to reconnect the water supply to the new fridge.
There are also considerations about inverters and batteries. Our Samsung works fine on the 2000W modified sine wave that was in the coach. We stuck with the three 12 volt house batteries since we are rarely not plugged in, running the generator or driving it so the alternator keeps them charged.
About three and a half years now and still love the residential fridge.