Thanks for the input everyone. I guess this all boils down to all families/couples/campers/retirees having their own wants/needs, and space "requirements" are from an individuals perspective based on many criteria. For instance, if we were full-timing or travelling months per year I can see where aspects of the 27-31 class would be very beneficial. On the other extreme, if we didn't have a young child I could even see a 23' being an option. As I stated before the 25' length always felt right for our needs/uses but the 27' was only being considered due to the bed layout.
The twin thing is an interesting topic and we as a couple would never have even considered it before this discussion. However, the more we discuss it, the more it makes sense....to us.
The longer mattresses of Twins are a plus for me ...I'm 6'3"
Twins are wider than 1/2 a queen.
My wife didn't like the pop-up access to the queen storage...regardless of orientation.
The extra external storage is a huge bonus
The easier access to top inside storage
The bedroom dressing space is superior in the twin
Someone mentioned earlier how twins would be like having a roommate rather than being a married couple.....but co-ed roommate fantasies could be fun