Welcome to the forum! We've never had a bathroom door lock on either of our Montana's and on our particular model the pivot door won't let you in the bath or bedroom with the slide in so we put regular hinges on it and avoided the problems some others have with the mechanism.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, MorRyde pin box
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.