I cleaned all my junk out of the Spartan and put it in my storage trailer. The soft spots on the floor seemed to be in more places then I was comfortable with so out came the circular saw and mask. I cut into and removed all signs of soft floor in the living room area. And this is what I ended up with. The cross bracing 3/4 ply on top of the steel frame is the issue. Over time it rotted and de-laminated. The floor itself was in OK shape but had carpet pad and stench stuck to it. 
I was able to move the kitchen upper cabinet to the storage trailer and remove the mouse stained shelf paper with my heat gun. It was so full of mouse urine and yuck that I am considering painting the interior of the cabinets to permanently do away with it.
Next week replace the missing floor? Also have a line on top grade birch at $20.00 a 4x8 sheet!
