....I believe there isn't a camper made that doesn't have one or several leaks somewhere on roof or shell walls. No matter how vigilant one is about caulking, believe that it is virtually impossible to caulk all leaks. With this in mind, it is a matter of a few years before our campers are destroyed by rot (some, in just 1 or 2 years!). There are the statistical outliers that will survive for 5 or more years. The sad thing is: I'll bet 8 out of 10 campers older than 2 years already have developed significant rot, completely unbeknownst to their owners.
The best one can do is to buy a camper made with rot-resistant materials to the greatest extent possible.
S-