Not sure about the Argosy but can describe the process for an Airstream. Pictures would help.
The divider wall between my bos and the couch had to be removed. This included the thermostat (label all Wires) and the gas light. Unscrew and remove rivets and move out of the was. Remove any other cabinetry to see the top and bollom of the fridge. The were two 4-6 inch wide straps screwed to the box. One at the floor and one attaching it to the rear wall. These are both held with multiple screws and are the main attachments holding the refrigerator in place. The cabinets and then attached to the top of the box. Carefully remove gas line and electrical, of course. I spent a lot of time trying to find bolts on the bottom of my unit but there were none. Itook apart a lot more than I wanted to but it did come out much stronger and would have to be done anyway because the refrigerator was a different size than the original. I had to fabricate different shims to secure all back. It came out real nice. Good luck.
Post pictures for more exact help.
1973 Excella 500