We own a 2002 Prowler Lynx travel trailer with a roll out room. The floor in the rear of the trailer feels "spongy". It is still solid, but the linoleum has definitely lifted. My husband has removed areas of the "house wrap" that seals the bottom of the trailer and it is wet underneath. You can see the solid insulation and I assume the wood is above that. Is it possible to repair the damage from underneath the trailer, or will we have to remove the cabinets etc from inside?Any help would be appreciated.

I would remove everything and replace all damaged wood. The risk of mold spores is too high here.