Our 5th wheel went through a series of issues when first new. All minor stuff but it meant taking the unit in several times to get stuff fixed.
Once the initial bugs were out....we had many years of no problems.
The unit is now 21 years old and still going strong.
Here's what I think happens-- A manufacturer of a successful brand or model of RV has trouble keeping up with demand...quality begins to lack in an effort to keep up with demand, things get missed maybe due to a shift change. Our manufacturer added a 3rd shift when the demand grew because they were getting so many orders for our model. Ours came with both faucets connected to water but not tightened down to the sink. In my mind that is something that would be missed during a shift change.