Crasster,
I have an air type mattress. Although it flexes fairly easily, there is a significant load that keeps pushing it off the platform as the head of the mattress raises. I have a felt covering on the platform (from the factory). First I tried a 2" raised edge at the foot of the bed but the mattress pushed over it. Then I went to a 5" raised edge and that worked well. You could probably try a strap across the mattress at the point of flexing but you might feel it as it would have to be fairly tight. My mechanism raises about 60 degrees.
Dave
07 Revolution 40E