Lsngth, or rather size is really only important when your towing. And most people only tow maybe 10% of the time. The other 90% your sitting in one place. Unless your boon docking a LOT it will make little difference. Except to your living comfort level. Pick a floor plan your most comfortable with regardless of size. At the end of the day bigger is always better. There is no subsritute for a comfortable bed, decent sized shower, plenty of cabinet space for dishes, or clothes, yea, the wardrobe might get paired down a lot, but you still need a decent selection of clothes to wear. Add in a washer/dryer... well you get the picture. Personally I could not imagine living in less thanmwhat we have. But I see people doing it in less. Heck, met a couple about 5 years ago full timing in a 11 foot truck camper.