RE: Driving with the LP on on the reefer....
For years I drove with the LP on and cooling the refrigerator, never
had it blow out.  Then I rolled the Westy.  (I Don't recall if the
frig was on or not).  Remembering the smell of gas after the rollover
and thinking about that, I now (in my replacement Westy) shut the gas
off at the tank and run on the DC while driving.  And oh yeah, NOTHING
is loose in the van when on the road now.  Look at where things end up
in a rollover just once, and with virtually no forward speed at the
time, and you'll do the same.