Did you see the
Vimco video on from 2008 on the water issues? The guy said they used 7/16" flakeboard which because of roof leaks has rotted out the whole trailer. How does your roof look? Regular "plywood" would be somewhat stronger for the floor. Near the end of this guys video he is under the unit. I don't see many cross braces for the floor. So thinking even with a dry floor you are getting some de-flection while walking on the floor. IU had a buddy who had a soft floor and added his own cross braces to give the floor more support.
If you look at this guy's video he has issues around the whole thing. The Cikira company started in 2005 and filed for chapter 11 in 2011. So not that long of a run.