I wouldn't count on the "high end" models being any different. Know some folks who bought a 2yr old airstream that was supposedly well taken care of and they spend a couple grand on floor repairs due to water damage.
That said, if you expect car level quality control, you are unrealistic. A lot volume passenger car may sell 50,000 units per year. A popular RV may sell 5,000 units...you can't implement the same level of quality control.
That said, once you accept you may need to adjust a few things, do a bit of caulking and keep an eye on things, it's really not that bad. Most issues can be traced back to not doing maintenance and ignoring issues while they get worse.
