Ours too are always deployed unless we are traveling. However, I do have a garage for the mh when at home and the mh is never exposed to rain, snow, wind, sun or freezing weather.
Recently tho, we had a defective solenoid for one of the jacks and the jack would not hold position. I'm currently in the process of getting that solenoid replaced. Not sure if having the coach on the jacks 98% of the time caused this solenoid to go bad or not.
Ron