RE: Driving with LP on....
Let me give you an example of worst case scenario, a real life example from
me.  I rolled my '85 Westy on a Forest Service road at 0415 19 Nov 2001.
Over onto the right side, up on to the top, down onto the drivers side,
about 30 feet down a steep bank.  I climbed out through the missing
windshield (had popped out as we came to a stop) but my passenger was
injured and needed assistance, took several minutes.  And we (was in a
caravan of about ten vehicles) could all smell gas.  Was the propane shut
off?  Couldn't tell, the rig was laying on that side.  Was the fridge lit on
propane and still lit, providing an open flame source for any gas fumes?  To
this day I don't know.  Probably knew at the time if it had been lit but
didn't even think about it.  And this was a not very violent crash, just the
roll over, virtually stopped when it finally went because of the not evident
soft shoulder.

Up til that time I had run many miles with the fridge lit on propane.  Now,
in my '90, I have second thoughts about it, usually run on 12v when on the
highway.