Roof seals, window and slide seals & caulking

I bought a 24' Forest River Evo trailer last April, used it last summer and had it winterized by the dealer end of August,brought it home & parked it in my driveway. I had debated whether to buy a cover for it, but after looking on the forum and around my neighborhood, decided not to. In a 1/2 mile radius of my home there must be at least 20 trailers; only 1 was covered for the winter. Last weekend I noticed that the paint on the front was peeling, as well as the decals. Upon entering the trlr, I discovered a big puddle of water on top of the slide, water on the countertop, evidence of water damage on the walls, and on the floor. Also a foot of the seal on the outside on top of the slide is not there (non-existent.)I called the dealership; they said to bring it in. Then they told me that the buyer is responsible for checking all seals and caulking every 6 months and they're not responsible, but that they'll contact the manufacturer. I think I'm screwed! I purchased a warranty; apparently it doesn't cover seals/paint! At no time did they tell me the seals had to be checked every 6 months, or I would've had them do that. At the time of winterization they didn't mention it either. Now my brand new trailer that cost me $40K may have to be taken down to the studs to fix! The service mgr. said the manufacturers can't crank trailers out fast enough; and they don't care about the little man like me; only the millionaires who buy the huge 3/4 million dollar motor homes. Do I have my head in the sand, or has anyone else had this happen? I feel sick to my stomach. . .Thanks for any and all input. I'm a 63-yr.old female, teacher, single. My dream has always been to own a trailer and camp. Now what??