I suspect you will need to super size to something in the 30'+ range.
We were looking for a "master bedroom" with a actual wall and door and queen bed, could not find that in sub 30' length..
Ended up buying a old 26'TT that needed a lot of love, gutted it and managed to fit a queen bed master bedroom plus a living room/dining room couch that folds out the a full size bed and added a twin bunk over that. Put a folding table that folds into the wall when not needed so one room does multiple duties.
If you really sit down and put pen to paper and draw out what you are asking for you will find out that you won't be able to fit it in a 26ft box..
