Finally cried uncle and decided to replace the Norcold refrigerator in my T@b 320. A number of others have done so with the Isotherm C65 which fits and reports seem to say it works very well. I have done a lot of investigation to find if there were any alternatives even if I used a larger unit and used the storage space below the existing unit, but it seems the Isotherm C65 is as big as can be used. My only issue with the Isotherm is it's made in China which I am trying to avoid if at all possible.
I have identified the Narcold NR740BB (1.7 cu ft) and the Nova Kool R1900 (1.9 cu ft) which should fit without any issues and both or made in Canada I believe. The only other is the Vitrifrigo C62IXD4-F (2. cu ft) which is made in Italy and is very similar to the Isotherm in size and shape. I have reached out to Vitrifrigo to get more detail dimensioning since the published dimensions don't provide enough detail to make sure it will fit. The bigger the unit the less free air space around the unit for proper condenser cooling which is a concern. I haven't seen where anyone has used any of these non-China units in a T@b 320 only the Isotherm unit.
I am leaning towards the Vitrifrigo pending confirmation on the dimensions. Any suggestions are appreciated.