When I bought my Lance, it had shields stick between back refrigerator cover fins. They look like factory made, but ugly.
I removed them and driving 9000 miles with speeds up to 75 mph never had pilot flame going out. My fridge is first unit on driver side behind the cab.
I did check and do some tests with my fridge.
When 120V element is like 250W , the 12V element is 180W, so they don't perform the same.
Test show very slight advantage of propane v/s 120V, so that is negligible.
I was getting 40/2F in the fridge with 100F outside and refrigerator side exposed to sun. Pretty impressive.
Just remember that propane burner leaves soot, what needs to be cleaned.