http://rv52.com/2011/02/rv-video-walkthru-2010-open-range-399bhs.html - 399 square foot fifth wheel from open range. Design for families with 1 or 2 children. You could probably do more, but it would get harder. 1.5 bath, fireplace, master bedroom, 2 air conditioners, heat pumps heating, with electric and LP gas backup, dual lp/electric hot water heater, cable driven slides, black tank rinse, central vac, windowed doors, super fan ( you can change out the air in the entire rig in about 10 minutes! ), designer pot/pan holder, microwave, range, oven, larger fridge, corian counters, 42 inch HD TV, surround sound system, automatic leveling system, 2000 lb carrying capacity, sealed underbelly with forced air, four seasons RV. This is a pretty neat unit.
http://rv52.com/2010/02/rv-video-walkthrough-open-range-345rls-fifth-wheel.html - Video walkthrough review of a RV ( recreational vehicle ). This is a fifth ( 5th ) wheel by Open Range ( OpenRange ) RV called the 345RLS.