There are a few manufacturers of RV ACs, Dometic and Coleman probably being the most common. You might have a look at a site like https://www.pplmotorhomes.com/rv-parts-rv-accessories
and look to see what is being sold, and the various features that you might prioritize. For example folks with short trailers typically like the look of a low profile AC, whereas for someone with a long trailer, they may not care as much. Similarly, if you are going to spend a lot of time in the trailer listening to the AC, you might prioritize quietness.
At any rate, on the topic of what is made where, with the combination of the trade war and the pandemic, you may find that anything made abroad is in short supply (meaning practically everything). Your decision might be made for you based on what you can buy, especially if you are in a hurry to replace your AC.