Your right there is no lemon law with rv's and hiring a lawyer won't do you any good...They are a big dealership and have a team of lawyers... and be careful what you say about the dealership... Some contracts have a clause that not only can you not talk badly about the dealership but also includes anyone in your immediate family... (I speak from experience)
Your doing the right thing... work with the dealership and take any help you can get with a smile and be prepared to inspect and fix anything they missed yourself... I would personally suggest... start watching youtube videos on how to caulk and check seals and the sky light. So you have piece of mind knowing what to look for not only now but in the future... good luck you two.....