Here's an older video of a Class A Fire that shows why a working Pressure Relief Valve on our Propane Tanks is so very important. You can start watching it at 5:20 as that's right around the time t...
Looking at the video, it seemed like there was a good bit of delay time for the firefighters to start pumping water on the fire.
I know virtually nothing about firefighting but seeing that video is a very good example not to pass a burning vehicle, especially, a RV with propane. That was amazing to see the flames shoot out the side.
I'm also surprised that the fuel tank didn't explode (if it did, I didn't notice it).