Don't have a Citation but I did get a custom mattress made for the front drop-down bunk in our Axis.
Here is a discussion of what we got:
http://www.thorforums.com/forums/f27...bunk-3220.html
The one I ordered is 1/2 & 1/2 memory foam and high density foam in a tri-fold arrangement so I can fold it up for storage. It is probably the most comfortable mattress in the coach now.