I know with my 377, the salesman reiterated a couple times to remember to push the pins fully in, otherwise a failure could occur. I know that there's only about 3/4 of an inch of pin to play with, and if I don't manually push them in, maybe only half of that is used. Not sure if this could have happened in your case, but it seems if your pins bind like mine do, its a possibility.
Hope you get it fixed and your level of trust comes back with the home away from home! Glad nobody was injured, as that kind of trust doesn't return easily!
2016 Ram 3500 4X4 Dually, 6.7 Cummins, 3.73
2017 Jayco North Point 377RLBH, Cummins/Onan Gen