On the Facebook TrailManor Fans page, Andrew MacLeod Peterson recently (Aug 24th) created a Google spreadsheet listing all TM models with a lot of information for each. I'm not sure the information for inside showers has been added yet, but again, other than a very few smaller, older models (Trailmini, 16RD, 19RD, and 2417), I believe all have had an full inside dry bath. When it comes right down to it, you'll have to do this research yourself. RVUSA.com has a pretty comprehensive listing of Trailmanors. Go to the Specs guide, select Trailmanor, and then you can search for specific models/years. This way, you can also start narrowing down which models you like based on other criteria you find along the way.
https://www.rvusa.com/rv-guide/specs-guide