Sorry to hear of your problems.
You really want to be rid of that camper; sounds like they sold you a lemon.
I don't know the details of the camper in question, but the mention of replacing wood and paneling being soft suggests this camper has considerable wood in its construction. If you look on this forum you will find many reports with pictures where people have started with a bit of a leak only to find that they have had to replace the whole roof, or rebuild the whole nose, etc.
I have a timber-framed camper and because it has an inner skin and an outer skin, water can often travel considerably between the two and cause a lot of rot before it even becomes evident inside the camper. By the time the kitchen cabinet in my camper was showing a slight water drip during heavy rain, the water had destroyed the top plywood layer of half the roof.
I'm telling you all this in case the dealer argues they can repair it - they might just repair the visible bits, but leave underlying structural damage.
I don't know what the law is in your state regarding rejecting items like this. That would certainly be my preference because after that string of problems and the way it sounds like they have been economical with the truth, I'd prefer not to use that dealer in future. However, if you can't legally reject the camper for whatever reason an alternative is to demand a replacement - so they have still made a sale. They can therefore sort out that camper in their own time and find someone who will take it.
Good luck,
Steve.
