Can I Pick Your Brains About Smaller Class C's?

Ron, thank you for the very informative overview of Class C models. My question, since the best Class C recommended feature is a solid fiberglass body to eliminate seams and potential leaks, what can one look for if deciding on an entry price class A model. The option
of one fiberglass shell doesn't exist. What about the seams on their construction and water issues? Thanks Trish