LP tanks have a built in release valve. In a fire the tank
will build pressure until the safety valve opens.
Gas will shoot out in a jet flame but the tank almost
never explodes. It vents and burns off until it's empty.
The trailer most likely did not explode. The sides simply
melted and fell over.
I'm glad we weren't parked close to it!!
I have a friend from work who spent years restoring one
of the old classic GM motor coaches. He and his wife
hand it completely re-done. It looked brand new.
While traveling the interstate across Kansas they were
running their genset to power the roof air.
A muffler bracket broke and dropped the exhaust
pipe. The genset was then exhausting right against
the rear wall. By the time they smelled smoke the entire
rear end was in flames.
They got out with their cat but lost it all.
Very sad. It was total loss and he just gave up and
no longer RVs.
Be careful out there! In spite of it going off every time
we make toast, our smoke alarm is our friend!