Sadly, it's across the entire RV spectrum of mfr's. When Alliance was announced, it was thought with high hopes that this mfr (not owned by Thor or FR), was going to have very high quality standards and emphasis on customer service. Well after being in business just a couple years, they too are building some less than reliable units with quality control issues. From what I see tho, they do seem to have a very good customer service area, but it's like down the middle (those with problems, those w/o problems). Shoot, even several hundred thousand dollar MH's have issues. You'll read many articles on the QC of RV's and how a lot are not 100% yet WE the consumer continue to buy them. Until we stop buying them, then the quality will change. You could probly buy the same 2 units at 2 different times of the year and 1 will have no probs and the other nothing but probs.
We experienced a prob 2 months into ownership of our '18 BC, but HL did take care of it and ok ever since. Yes we ordered/purchased it in early/mid spring of '17. Another owner w/ same exact RV has had several issues. Go figure.
Sorta along the same lines, but with snowmobile trailers. There is a decently well know mfr approx 60 miles from my house, but I chose to go w/ a mfr over 6 hours away. Small company with attention to detail and the BEST customer service. They have customers from all over the US and Canada and because they have no dealers and won't, one has to drive to NH to get it. You can buy a big name trailer but quality and workmanship is another thing. That's why I didn't go w/ mfr by my house. Trailers look nice, but suffer from quality, workmanship and poor customer support. Sled trailer is 8 years old and still in tip top shape.
Another way to look at it is, well your driveway. A company digs things up, puts down stone (perhaps a weed blocker fabric), base and top coat. The top coat is like icing on a cake. Looks good, but what about the quality under it? If the digging, stone and base coat are not done correctly, then regardless of how the top coat looks, it WILL fail. So RV's are no different. Massed produced and if attention to detail isn't adhered to, the whole coach will suffer.