OBG,

According to the LP plumbers I have spoken to about this, you should not need to replace any lines unless they are flexing repeatedly or rubbing with movement of the vehicle.

I also questioned said plumbers regarding the select few homes I have built for customers that use propane due to no natural gas in the area (rural). They advised that no pipe/valve replacement is needed unless there is some outside caused damage.

I will say that the homeowners I have built houses for with LP are getting two things in their Christmas cards this year. 1) a printed copy of the above picture. 2) a gift certificate for a propane detector.

Replacement of the LP detector is a mixed bag. Some say every 5 calendar years, some every 5 years of actual powered on use. Go figure, two "experts" that cannot agree on how long 5 years is.

I mentioned that much of 5 calendar years would be lost on a shelf awaiting purchase unless in a truly sealed container. Stopped in at Camping World and saw that they aren't sealed. That removed one "expert witness" from the courtroom.

As to the BLEVE's, I was told by my brother in law (retired fire fighter) that ther is one "fool proof" method to know if you are too close to a burning LP tank.
Hold you pinky finger at arms length. Using the pinky fingernail as a "front sight" ensure you can cover any sight of said fire scene. If you can see the scene around the edges of the fingernail, you are WAY too close.