Whether a person chooses to make the decision to let this situation burn and not try and save the coach, or, dive in there and make a conscious effort to save his/her prize possession, is of course up to them. There should be no ridicule of either decision. That's why we're all grown-ups. We have lived enough, long enough, and have learned to or, been forced to make decisions, sometimes in emergency conditions, that will have an influence on whether or not, to walk away or, make the effort.
None of us ever would want to see that same situation happen to us. It's happened a few times. Without investigating that particular incident, and, interviewing the driver/passengers and anyone else that might have been involved with the hook-up and prep for towing, it's pretty hard to speculate on the cause of this incident. It would be nice if a parallel driver to the Liberty could be sought out and, would or could be interviewed, to state what he/she first saw, in terms of smoke/flames/issues/tires dragging/vehicle attitude (leaning down or up)/liquids being expelled/ and much more.
I too use the T-shaped red handled pins for our tow bar. I use spring loaded pins to keep those T-handled one in place.
They've not failed me yet. And, they're pretty easy to use.
Anyway, again, keep things safe out there.