In my opinion I think what you may find is that most RV problems are not so much with the RV as they are with the dealer's service department. A lot of complaints mention the amount of time it has taken to get their coach repaired or that it took a few visits for the dealer actually find what was wrong and to correct the problem.
From reading the posts on this forum, it seems that a lot of RV dealers just do not have professional mechanics that know how to properly diagnose the problem. They throw parts at a problem with the hope that it fixes it.
In most cases where the owners have posted the solution for their problem, it was NOT a major issue, but rather a somewhat simple issue that, once discovered, was corrected.
Of course when you are on the road, and your RV breaks down, the only thing you are interested in is getting it repaired and back on the road again. If you are lucky enough to find the right RV shop that has professional mechanics, this may be a quick and inexpensive turnaround. If not, you are at the mercy of incompetence and you will think that you have an RV that is a lemon when, in reality, you are just dealing with one of the many poor RV service departments.