I don't think it is just RVs that are having the quality slippage, although RVs are a prime example of the problems.
Before the recession, companies had really started to figure out that having poor quality was not a good thing, and that higher quality paid off in the long run with happier customers, better reputations, and less warranty costs.
Unfortunately, when things got tight, the first thing to go was anything that was seen as non value added by accountants, and that included lots of quality related things. Training, good tools, improvements, etc all went away for many, many, companies during that time period.
Unfortunately, now that times are good and profits up, the bar for quality has already been severely lowered so there is not as much incentive to get back to doing a better, quality job. When you see $150K high end RVs with the lowest end import electronics in them, you know that they are just maximizing profits and not concerned about quality and reliability, or their customers.
I don't think the RV quality will start to improve much until the market saturates with more manufacturers so quality gets to be more of a visible determining factor between brands and the weaker players either have to improve or vanish.
In the 80s and 90s, there were lots of programs from consultants that claimed that "quality is free". The premise was that the costs of improved quality would be covered by reduced scrap, returns, rework, etc. Places I worked went through many of the programs and found the improvements didn't turn out to "free" in the short term dollars evaluations, which disappointed many of the executive and accountant folks. What the improvements did do was assure survival when markets got very competitive or there was a slowdown, when all the low quality suppliers would start to go under.
IMO, there is really no reason to have poor quality and customer service in this day and age, and with the economy doing well. The only reason things haven't gotten better is because of greed for profits over sustainability and because the public hasn't yet revolted and demanded better.