Sometimes people state--in their posts--mattress sizes and names that are not the same as commonly used outside of the RV world. While that might not be a problem for many, here is a web site listing mattress sizes and names that are usually used in the industry.
http://www.google.com/imgres?imgurl=...ed=0CEAQ9QEwAw
The so-called "king size" mattress in a Mobile Suites is likely a "short California King (72 x 80)', which is a different size than a true "King (76 x 80) or standard California King (72 x 84)." The link above
gives what seems to be the accepted mattress terminology and sizes.
Incidentally, one can use a true "King" mattress in a Mobile Suites if one wants a bit more width. In our case, we had the factory make the bed platform a bit wider to support a true King---even though the standard
bed platform will support the King even if the King is a bit wider than the platform for the short-California King--as usually found in a Mobile Suites.
There also might be another short-king and a short-queen for RV application. I think there also is a "giant King mattress" for home use. But, I am unfamiliar with those mattress sizes.
I hope I conveyed the correct info on the Mobile Suites mattress sizes. If not, let me know.