Warranty work on a travel trailer

As we were taking delivery of our brand new travel trailer, we noticed some bubbles in the slide’s ceiling. I took a picture, and we put it on a list of things to be fixed with the dealership. Now the travel trailer company is saying it’s the dealer’s fault, and the dealer is saying it is not. The dealer has offered to split the cost of this expensive repair with us. We don’t feel we should have to pay anything as it is still under warranty and noticed upon the day of sale.
Since we took delivery with good faith that it would be fixed, what should we do? There are also issues with the unit’s waste tank valves. We are concerned those won’t be fixed under warranty either. Any advice?