I don't think you will find any
responsible person advising keeping your gas bottle turned on while driving. Some people may do it but they are the type who don't think about the consequences (if they were involved in an accident)
Annoyingly it's often the other parties who get injured or killed while trying to contain a fire caused by this inconsiderate attitude and NOT the person who thought only of themselves.
But nothing unusual there, you see it everywhere these days
ETA:-
What are Truma's secumotion hoses ? Do they claim they are safe in an accident ?? Have they been tested and approved by some
independant testing house ??? If the bottle is on and a hose is ruptured gas will escape, how can you
guarantee a hose will not be damaged ??