Good tight crimp on left, bad loose crimp in right
Cheap crimp tools on left, excellent ratcheting style crimper - the two on the right.
Then you have the skill level of the "professional" staff that wired up your camper.
Now you know why some wiring jobs last 30+ years and some fail 1st year. Even at the same company, it's a crapshoot with the quality of the wiring jobs. It really came down to who did the work. Some guys were good and some guys not so much. I used to be a traveling field service tech. One of my first questions back to the factory was........who wired it?