I know we seem to be going in circles but the just let it burn is fine. Until it puts the neighboring RV in jeopardy.
I generally stay where sites are spread apart. But I have certainly been in sites close enough where a burning RV could easily ignite another.
I 'm not suggesting one put themselves in harms way and turning off the tank could certainly do that.
On the other hand if I can limit the fire I imagine I will try within reason vs. taking a strict let it burn approach.
RV on fire "So what" is easy to say unless that RV is 5' away from yours.
While I agree with you sentiment, this is one of those, "You had to be there" moments. If you are only 5' away, I would guess the fire is going to spread even without any help from the propane. Its a personal call and hard to pin point what you would do. If the fire is towards the rear of the RV, most tanks are in the freont, then sure why not but if the RV is fully engulfed, RUN!!!!
Happy Glamping and lets hope we never have to see what we would do!!