Many years ago FORD got burned by some Pintos with the optional exploding gas tank.
Well there were some rumors of GM having the same problems with Pick Up trucks, and one TV network filmed a staged accident where sure enough the fuel Tank blew up.
An expert did a frame by frame and proved the cause of the fuel tank explosion on the GM truck... It was rigged to explode by a Special Effects engineer.
Propane tanks do not, normally explode.. to make them explode you have to get them very very very hot. A tank is usually rated for how long it can sit in the middle of a fire and not blow.
One of the newer tanks sout there is a semi-transparant tank made of man made materials I forget which plastic they are using. ON this tank you can check the level of propane in the tank by simply looking at it.
Well they built a fire under it and filmed it.. Sitting there, not exploding, Eventually it vented and jetted flame, and I do not recall if it ever did rupture and blow.. but if it did it took quite a while.
To make a propane tank blow you have to rupture it, this is next to impossible save in a very specific kind of traffic accident.. The exploding truck they yammer about carrying Propane.. was not carrying propane, the news article tells you what it was carrying, but it was not propane.
Now what can explode..... If a burner is left on but not lit, propane can build up inside the rv... If the concentration gets to the magic point and there is a spark, say from a light switch.... KA_BOOM!
NOTE SAME applies for a sticks & Bricks and natural gas.. EVEN IF YOUR HOUSE IS ALL ELECTRIC, there have been several natural gas explosions where the gas was indeed natural, it was not even piped in, in fact no lines in the area (Swamp gas is Methane, an explosive natural gas).