On our 2002, I installed a small "ice maker" water filter into the line feeding the ice maker, behind the fridge. It is very simple to do.
The problem with the propane fridge's, is that the back is exposed to the outside air temperature. In hot weather when the ice maker is not being used, for extended periods of time, the water in the lines behind the fridge can get stagnant. If the power to the fridge is off in freezing weather, you can freeze the solenoid. (Don't ask how I know.)
2007 Limited SE 40fdts
Las Vegas, NV