Thank you for all the responses so far. Having read the warranty restrictions in detail, it looks like they give themselves several get out clauses. These include exclusions for damage due to the environment and consequential damage such as mold and mildew. If they just attempt to seal everything without removing the wet insulation, I suspect I am heading for problems down the road.
While the fiberglass insulation may dry our rapidly in a dryer climate like California, I suspect it will take much longer here in New York (currently 52 F with 69% relative humidity). The wet insulation is in contact with the wooden structure of the trailer body, so I would like to get it dried out ASAP.
For clarification, the trailer does not have an enclosed underbody, so there is no Coroplast sheeting spanning the gap between the lower frame rails. The plastic sheeting I mentioned spans the entire width of the trailer and runs across the top of the frame rails.
