Lots of great, informative responses! I would have to agree that with the flexing of the trailer during transit, caulk and sealant will crack and require regular maintenance attention. I was referring to seams. Every penetration of the roof or sidewalls.
I sent a message to a local mobile RV repair professional and he wholeheartedly recommended Forest River products. I'm guessing for several reasons, one of which must be that they pay him fairly and timely. He's authorized to perform warranty service, repairs Norcold and Dometic refrigerators, does restorations, etc. I figured he would be a good one to ask about brand reputation. I thought about buying the rvreviews book, but it seems to me the information here and from someone like him is just as good, if not better.