Sorry for your luck! It is probably very common, although I would expect to see pex. The problem is that your clamp was in the wrong place(at least it appears that way from the pic). It looks like it was too far away from the fitting. If you re-clamp it with a worm clamp in the right place it should be fine.
I had the same thing in my 365SAQ, but it was the clamp for the cold line to the outdoor kitchen sink. It was not crimped properly, and it was too far away from the fitting. We would fill our water tank for a 5-7 day trip to the state park, and 2 days in we would be out of water. Then we would pull away from the site and there was a waterfall from the bottom of the camper. That line would just continuously leak all day long and the water pump would keep running as the pressure dropped.
What happened to quality being job #1?
2012 Sandpiper 365SAQ
2008 F250 Lariat CCSB, Deleted and Tuned