Had the same problem on my 2015 Four Winds. Solved with a door kick stand. If you use this solution, put it on the bathroom side of the door to prop it open while underway. If you put it on the outside of the bathroom door to keep it closed, you will one day find yourself locked in the bathroom if the kick stand falls down by itself.
Making a smooth transition to senility for over 70 years
2017 Freedom Elite 29fe
2015 Jeep Wrangler Toad