Although our 310RE is set up to take a ducted AC, I am going with non-ducted when I get around to adding one in the bedroom, the reason being that I think the ducts are already undersized for the single AC. Also, I want to be able to run only the bedroom AC for times when the front of the trailer (which is black) is pointing towards the sun (two zones). We will also get the strip heat option to help take the chill off in the winter. Installation should be easy for someone with average mechanical skills (do a youtube search), but the units are just over 100# so unless your husband is built like Arnold (in his younger years) he will need help getting it up on the roof.
Here is the one I am looking at:
https://www.amazon.com/gp/product/B0...A33FSTHZ6STYHL
https://www.amazon.com/gp/product/B0...A32JMRLJAMEVOJ
https://www.amazon.com/gp/product/B0...A33FSTHZ6STYHL