Has the floor construction of the lighter trailers improved?

[Ham_Bone]

Some owners of the lighter lines of FR trailers have reported the floors progressively getting spongier through use. Apparently the luan/foam/luan sandwich starts to sag as the foam is compressed. Earlier threads on this board alluded to FR adding more bracing in the aluminum frame that encompasses the sandwich. Is that true? Can anybody say definitively that FR has addressed this issue by tweaking the construction in anyway? I noticed the most recent construction description from FR is describing the foam as "high density". Anyone have access to an older brochure so they could check the description of the foam used in previous years?

Thanks in advance for any responses.