http://www.safaricondo.com/alto/caracteng.php
http://www.safaricondo.com/alto/1713/indexeng.php
It offers a king-sized bed and a black water tank too. To me the real drawback is the bathroom, the solid walls are too short and it's a wet bath. If you order the optional bunk it can sleep 4 in 3 separate beds. It is very lightweight, 1635 lbs., and 17 1/4 feet long overall closed.
They appear to sell for between $22K and $25K (not sure if that's Canadian or American $$).