Mine is the 18L, which is no longer made, but it is the identical floorplan to the 19RD. See my previous link with photos to see the floorplan at the top right of the page.
So the toilet is on the back wall of the trailer, sink on driver's side wall, door opens into hallway, and there is a mirror on the last wall to the right of the sink. It's not in the photo, but my showerhead holder is mounted on the lower wall below the mirror just to the right of the electrical outlet. My towel bar is mounted above the toilet. There is one very small upper cabinet above the counter in the far upper left corner.
The walls are the same height as the larger TM models, but I don't have the vinyl skirting up top. The shower curtain comes as 2 panels with the continuous racetrack type slot overhead. I want to keep 1 curtain to keep the sink and toilet covered and put the vinyl sheeting or whatever I end up using over the door and mirror walls. Right now I push the curtain back a bit so it is laying flat over the toilet and will actually use the toilet as a chair while showering sometimes (lid closed of course
) for more elbow room.
I plan on pulling the trailer out next week so I can get started on experimenting. I will try to post photos.