My RV is 40 years old. 17 years ago I had to replace the first LP fridge because the repair facility I left it with moved the RV to a non-level spot (after promising not to move it). The 17 year old replacement is still going strong. It gets turned off after nearly every trip, but it's also been left on for whole seasons (spring through fall) when we were using it heavily. I can't see that it makes any difference whether you leave it on or off, other than the cost of the gas or AC to power it. I leave it on when it's too much effort to empty it.
