As Dan said, I believe the Mini is the smallest model, since it has a rear deck as opposed to a rear shell. As for a bathroom, there used to be a 2417 Sport (narrow, no bathroom) and a 2417 Standard (wider, with bath). There may also have been a 2619 Sport with no bathroom. All of these are discontinued, so you will be dealing solely with the used market. They are not plentiful.
For a bit of info on the 2417 Sport, check out this 12-year-old thread.
https://www.trailmanorowners.com/for...ad.php?t=14559
Bill