I think I must have missed something.  What is the logic behind wanting to run
the fridge on propane while driving?  You'd be using up your fridge's camping
energy source while traveling when you could be conserving the propane by
running off the battery/alternator.  I'm reasonably sure that if you work out
the energy calculations, you'll find the propane to be more efficient than
electricity, but it still misses the point of having the propane as an energy
source when you don't have access to electricity . . .

Just curious,
Marc Perdue