IDman wrote:
Yes, we always ran with LP on UNTIL we stopped for fuel.  I would pull over before we got to the station and turn it off at the cylinder.  After fueling, I would pull out of the station, or at least away from the fuel pumps, and turn it back on.  Then I would enter the TT to make sure the frig was lit again.  
Safety first!!
What is it about fueling up that makes you want to shut off the propane?
When I had a trailer, the propane was always on until it needed to be switched or until I put it in storage.  Now, the only time I turn it off is when refilling the tank.