I come at this from a boat point of view and that may color things but ABYC has disallowed copper for propane (in the supply line) in boats due to vibration fatigue.
That said, with pipe under the coach there is no where for the propane to settle with a leak. On a boat you have a bilge that has no way for propane to exit (because water would come in). It may very well be that a propane leak 1000 miles from land in a boat is a much worse thing that one on an Interstate 100 miles from anyone else.
I would have thought, however, that the vibrations in a road vehicle would be much worse than on a boat.
I did see some pictures of a 50 foot boat that had a partial 20# tank go. I would like to avoid that. ugh.
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