I joined the Montana forum and visit it frequently. There are probably thousands of members on that forum and many of them are experts on repairing/maintaining their fivers. If you own anything from the Montana line you can always get your tech questions answered there.
When you visit the MOC you will read about all the stuff that goes wrong with Montana fivers. Just like with any RV they have their issues. But that is part of the purpose of that forum. It is a place to go to when you have an issue where you can get answers. Having that type of experienced support at your fingertips is critical for us as full timers.