fifth wheel soft spot

Before you get all upset, I would do a quick check out yourself. On my Montana there is a area from front to back. Like a crawl space on a house and this is where the tanks are located, plumbing, air/heater duct, and our 5er its a heated space to keep warm so the tanks and plumbing from freezing..Now in my storage area if you remove the panel to see into this area..this way you can see into this area of the floor and also see how its put together, for it also could be the seam on the sub-flooring or how the heat duct is put in your 5er..I would also go to your members forum on your rv and if others have noticed this as other RV's do,such as for my rv the Montana...good luck on your finding of the floor...