I use what is called a three in one toliet
it can fold up and when unfolded it slides over the toliet, it has arm rests and raises the height
here is a link to one, never bought from this link before as I just get them at my local pharmacy but wanted to show you what they look like
you do not have to bring the bucket part just the sides and seat, so it will slide right over the actual toliet in your cabin
hope this helps I had a bad hip replacement it was a big help
if you want to bring the bucket part you can keep the potty area right next to the bed
tammy