The flame to run the fridge is quite small, and if it goes out, the thermacouple shuts of the gas supply. Like anything else, the propane system needs maintenance. If you tow your trailer a couple thousand miles each year, you should have the propane system leak tested every 2 or 3 years. System leaks are a far more dangerous thing, whether you use it on the road or not. Leaks can still be there after reaching your destination.
Sorry for getting off the original topic of fridge performance.