Jim....I've done three of them. If you can find an RF197, it would be huge. It will run on your inverter with no issues and fit your cabinet like it was made for it. If you find the RF197, it will fit thru your front door. You take your passenger mirror, loosen it and swing forward. Next, you disconnect one end of the upper door arm. This allows your front door to swing all the way open and gain two inches. Lastly, you unbolt the passenger front seat and move it out of the way. If using the Samsung, it's lighter than what your removing. Strip out the interior shelves and remove the doors. It will fit thru the front door with an inch or two to spare. It's pretty light and can be done by two people. One inside and one outside.
Make a rolling cart out of a Harbor Freight furniture dolly so you can roll the refer around inside the coach. If you make it the same height as the floor of the new refer opening, you can slide it right in.
On my Diplomat, I had the heater under the old refer. I had to cut the feet and rollers off of the Samsung and didn't install a new floor. I just used a rail system. I also added a second Magnum, 600 watt inverter to run just the refer.
PM me if you have any questions.