I agree with Dutchmen Sport - it seems like the author of that blog has made a few observations (such as the hunting trailers) and has used that to bash all RVs.
Yes, RVs need to be maintained. You need to check for leaks after the first rain of the season and preferably after every heavy rain thereafter. At the first sign of a leak, you fix it. You don't let it leak for months and then claim the RV was "defective" because there was water pooling up under the mattress.
As ron.dittmer points out, there are various grades of build that can reduce your potential for issues. But even if you go with the least of them, you can have years of happy RVing by just being observant and keeping up with general maintenance. Re-caulking seams and windows and vents on a regular basis (yearly, etc., depending on the individual needs) can prevent most of those problems. And a single incident of a leak is not going to destroy the RV - that's why checking after the first and any heavy rains is important, because you can stop a leak before it has a chance to turn into mold and rot.
