After three years in our B and crawling over each other my wife and I decided the next one would have a full time queen bed in the back. We looked at several and wound up with a 27' (26Q floor plan) that we both could get in and out of without bothering the other and the bed was not sandwiched in the back corner against the bathroom.
If it had been me alone (and the dog) I would have gone for something shorter with a corner bed. We got lucky and found a queen bed floor plan we both liked in a 27' (max length we wanted) without having to deal with any slides.