Under side of camper rotting

Yes, but it did leak a bit after that and he said that is normal to have some leakage during heavy rain which we all know is bull, so I found a seam inside the fridge compartment that was open and sealed it and had no more water leaks that were visible. At this point warranty work is no way possible 4yrs out, I just want to know if there is anyway to salvage what I have. I peeled away the membrane under the camper in hopes that the wood will dry, lots of water trapped between membrane and subfloor, the interior flooring is still good, no soft spots. There is no way to remove the membrane under the trailer framing so not sure how that's going to dry, the areas where I did get it off are drying and the wood is not rotted through so there is a little hope yet. 

I have a 2014 178 that when first purchased had water issues, if we pulled it during rain the inside of the camper flooring would be soaked, the dealer said the slide out wasn't properly adjusted. We haven't towed it during a heavy rain storm since and assumed the problem was resolved until this weekend. We towed during a four hour rain storm and the inside was wet. I am obviously way beyond any warranty work, but here is the horror of the issue, all of that water has been getting trapped between the black undercoating material and the wood, the underside of my pod is mush. It's not like I don't take care of it either, I re-caulk all the seems every season, and I have kept it covered.