'05 Safari Flooring damp area above spare tire.
In the "A" portion of the frame, my trailer does not have the dropped belly pan area airspace. The aluminum pan pretty much hugs the flooring. This area appears to be almost hermetcally sealed. Any water leakage into this area has nowhere to go except moisten the small airspace and wet the flooring.
I noticed an area of discolored vinyl flooring under the front sofa. I sliced a portion of it open with a knife to inspect the OSB floor-which is not discolored and is still strong. However the floor did feel a little moist under the vinyl covering.
It appears I have a leak from the window or other area of the front of trailer. A visual inspection didn't reveal any obvious areas.
I drilled 6 half-inch holes in the bottom of that area's belly pan. I felt moist insulation through one of the holes, the others were dry. This will give some ventilation, allow any leakage to drain, and allow me to monitor the degree of leakage during a rainstorm or during further troubleshooting. I will get some rubber firewall plugs to fill the holes when needed.
I'm posting this as a heads-up to be extra aware of this area regarding leakage. The frame bottom mounted belly pan area has many exit points for accumulated water, and better ventilation. There is less likelihood of water setting right up against the floor. But this front area, above the spare tire, has no ventilation, and the aluminum pan traps the moisture against the flooring. Something to keep an eye on.