I have fixed the underbelly (put back together the isolation and Gorilla tape it), still no signs of water damage.
Also, I got a big bag of moisture remover.
Concrobium Moisture Grabbers™ XL
Damp, musty areas such as basements and crawlspaces, and for areas that can trap humidity such as attics and garages. Concrobium Moisture Grabbers XL can even be used after flood damage for longer term moisture management. And the easy-to-place design makes them perfect for moisture control in recreational vehicles such as boats and RVs.