You could take the bottom bunk or whatever one you choose and turn it back into cabinets/drawers. Add built it drawers in the wings of the walk in closet, some help from a good closet organizer.
I'm sure if you like that bus enough and you look hard enough you will find somewhere, a good spot, to add storage and in keeping with the existing decor.
I know it is just another compromise but that is a situation that will almost NEVER go away.
I like the rear bedroom +bunks in the isle floor plan. Seems like there isn't too many of them yet many who would desire that convenience.
Debi. A small closet in the rear? You could turn that into another bedroom I know I know