It seems clear that many things will work just fine. What doesn't work is carelesness and ignorance. If the important things are done right, it does not have to be very sophisticated or exotic.
If you run wires near a sharp edge, either get rid of the sharp edge or protect the wire. Not exactly rocket science.
If you keep adding stuff to an existing circuit, check to see if the wire can handle the extra current.
Make sure that all of your connections are secure.
I just think that many manufacturers struggle to make ends meet by cutting corners.
Whether it is using inferior materials, not taking the time to design and review the proposed project.
Hiring lower cost labor or unemployable (i.e., people that can't pass drug tests other places).
Not training employees on the workmanship standards that are expected or even having workmanship expectations.
Many Coaches are delivered "not quite done".
Customers push for a delivery and manufacturers don't want to disappoint, (or more likely need that check), by missing the delivery.
This causes rushing which can't help but cause mistakes.
The lesson here is be diligent, ask questions, look at what you are buying, or check carefully what you have bought and have a great time.
That is after all why we buy or build these things. Nothing is more fun than hitting the road.
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