Has anyone had trouble fitting an 18.5 inch RV toilet in a tight bathroom?

[michaelbrown]

Hi everyone, first post here. We have a 2019 Class C with a really tight bathroom, and the toilet that came with it is on its last legs. I have been poking around online at 2026 models and a lot of the ones that look promising are listed at 18.5 inches, which seems bigger than what is in there now. My concern is clearance. There is a wall right behind the flange and the door barely misses the current seat, so I am not sure a taller or deeper toilet would fit without hitting something. I have measured roughly but not pulled the old one yet. Before I order anything, I would like to hear from people who have actually swapped a toilet in a small camper bathroom. Did the 18.5 inch size cause problems, and is there anything about the flange or water line I should check first? Any input appreciated.